Remove dead code from System.Net.Sockets (#24904)

* Deleted dead code from System.Net.Sockets.

* Deleted stuff related to socket perf counters.

5 files changed, 98 insertions, 322 deletions

diff --git a/src/System.Net.Sockets/src/System.Net.Sockets.csproj b/src/System.Net.Sockets/src/System.Net.Sockets.csproj
index 4883cb0ac4..192143d368 100644
--- a/src/System.Net.Sockets/src/System.Net.Sockets.csproj
+++ b/src/System.Net.Sockets/src/System.Net.Sockets.csproj
@@ -30,7 +30,6 @@
   <ItemGroup Condition="'$(TargetGroup)' != 'netfx'">
     <!-- CoreCLR (All Operating Systems), .NET Native -->
     <Compile Include="System\Net\Sockets\SocketTaskExtensions.cs" />
-    <Compile Include="System\Net\SocketPerfCounters.cs" />
     <Compile Include="System\Net\Sockets\IOControlCode.cs" />
     <Compile Include="System\Net\Sockets\IPPacketInformation.cs" />
     <Compile Include="System\Net\Sockets\IPProtectionLevel.cs" />
diff --git a/src/System.Net.Sockets/src/System/Net/SocketPerfCounters.cs b/src/System.Net.Sockets/src/System/Net/SocketPerfCounters.cs
deleted file mode 100644
index 49f4d3531a..0000000000
--- a/src/System.Net.Sockets/src/System/Net/SocketPerfCounters.cs
+++ /dev/null
@@ -1,33 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-using System.Diagnostics;
-using System.Threading;
-
-namespace System.Net
-{
-    internal enum SocketPerfCounterName
-    {
-        SocketConnectionsEstablished = 0, // these enum values are used as index
-        SocketBytesReceived,
-        SocketBytesSent,
-        SocketDatagramsReceived,
-        SocketDatagramsSent,
-    }
-
-    internal sealed class SocketPerfCounter
-    {
-        private static SocketPerfCounter s_instance;
-
-        public static SocketPerfCounter Instance => LazyInitializer.EnsureInitialized(ref s_instance);
-
-        public bool Enabled => false; // TODO (#7833): Implement socket perf counters.
-
-        [Conditional("TODO7833")]
-        public void Increment(SocketPerfCounterName perfCounter, long amount = 1)
-        {
-            // TODO (#7833): Implement socket perf counters.
-        }
-    }
-}
diff --git a/src/System.Net.Sockets/src/System/Net/Sockets/MultipleConnectAsync.cs b/src/System.Net.Sockets/src/System/Net/Sockets/MultipleConnectAsync.cs
index 29080a0376..b9f3db19fe 100644
--- a/src/System.Net.Sockets/src/System/Net/Sockets/MultipleConnectAsync.cs
+++ b/src/System.Net.Sockets/src/System/Net/Sockets/MultipleConnectAsync.cs
@@ -33,8 +33,6 @@ namespace System.Net.Sockets
 
         private object _lockObject = new object();
 
-        protected abstract Socket UserSocket { get; }
-
         // Called by Socket to kick off the ConnectAsync process.  We'll complete the user's SAEA
         // when it's done.  Returns true if the operation will be asynchronous, false if it has failed synchronously
         public bool StartConnectAsync(SocketAsyncEventArgs args, DnsEndPoint endPoint)
@@ -163,7 +161,7 @@ namespace System.Net.Sockets
                 if (_state == State.Canceled)
                 {
                     // If Cancel was called before we got the lock, the Socket will be closed soon.  We need to report
-                    // OperationAborted (even though the connection actually completed), or the user will try to use a 
+                    // OperationAborted (even though the connection actually completed), or the user will try to use a
                     // closed Socket.
                     exception = new SocketException((int)SocketError.OperationAborted);
                 }
@@ -186,7 +184,7 @@ namespace System.Net.Sockets
                     }
                     else
                     {
-                    
+
                         // Keep track of this because it will be overwritten by AttemptConnection
                         SocketError currentFailure = args.SocketError;
                         Exception connectException = AttemptConnection();
@@ -270,7 +268,7 @@ namespace System.Net.Sockets
             }
             catch (ObjectDisposedException)
             {
-                // This can happen if the user closes the socket, and is equivalent to a call 
+                // This can happen if the user closes the socket, and is equivalent to a call
                 // to CancelConnectAsync
                 return new SocketException((int)SocketError.OperationAborted);
             }
@@ -413,8 +411,6 @@ namespace System.Net.Sockets
         private Socket _socket;
         private bool _userSocket;
 
-        protected override Socket UserSocket => _socket;
-
         public SingleSocketMultipleConnectAsync(Socket socket, bool userSocket)
         {
             _socket = socket;
@@ -445,7 +441,7 @@ namespace System.Net.Sockets
 
         protected override void OnFail(bool abortive)
         {
-            // Close the socket if this is an abortive failure (CancelConnectAsync) 
+            // Close the socket if this is an abortive failure (CancelConnectAsync)
             // or if we created it internally
             if (abortive || !_userSocket)
             {
@@ -464,8 +460,6 @@ namespace System.Net.Sockets
         private Socket _socket4;
         private Socket _socket6;
 
-        protected override Socket UserSocket => null;
-
         public DualSocketMultipleConnectAsync(SocketType socketType, ProtocolType protocolType)
         {
             if (Socket.OSSupportsIPv4)
diff --git a/src/System.Net.Sockets/src/System/Net/Sockets/Socket.cs b/src/System.Net.Sockets/src/System/Net/Sockets/Socket.cs
index b7edd69b9b..b6bf2b3131 100644
--- a/src/System.Net.Sockets/src/System/Net/Sockets/Socket.cs
+++ b/src/System.Net.Sockets/src/System/Net/Sockets/Socket.cs
@@ -69,7 +69,6 @@ namespace System.Net.Sockets
         private int _intCleanedUp; // 0 if not completed, > 0 otherwise.
 
         internal static volatile bool s_initialized;
-        internal static readonly bool s_perfCountersEnabled = false; // TODO (#7833): Implement socket perf counters. 
 
         #region Constructors
         public Socket(SocketType socketType, ProtocolType protocolType)
@@ -334,7 +333,7 @@ namespace System.Net.Sockets
             set
             {
                 //
-                // This implementation does not support non-IOCP-based async I/O on Windows, and this concept is 
+                // This implementation does not support non-IOCP-based async I/O on Windows, and this concept is
                 // not even meaningful on other platforms.  This option is really only functionally meaningful
                 // if the user calls DuplicateAndClose.  Since we also don't support DuplicateAndClose,
                 // we can safely ignore the caller's choice here, rather than breaking compat further with something
@@ -1148,18 +1147,6 @@ namespace System.Net.Sockets
                 return 0;
             }
 
-            if (s_perfCountersEnabled)
-            {
-                if (bytesTransferred > 0)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesSent, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsSent);
-                    }
-                }
-            }
-
             if (NetEventSource.IsEnabled) NetEventSource.Exit(this, bytesTransferred);
             return bytesTransferred;
         }
@@ -1219,18 +1206,6 @@ namespace System.Net.Sockets
                 return 0;
             }
 
-            if (s_perfCountersEnabled)
-            {
-                if (bytesTransferred > 0)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesSent, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsSent);
-                    }
-                }
-            }
-
             if (NetEventSource.IsEnabled)
             {
                 NetEventSource.Info(this, $"Interop.Winsock.send returns:{bytesTransferred}");
@@ -1314,7 +1289,7 @@ namespace System.Net.Sockets
         public int SendTo(byte[] buffer, int offset, int size, SocketFlags socketFlags, EndPoint remoteEP)
         {
             if (NetEventSource.IsEnabled) NetEventSource.Enter(this);
-            
+
             if (CleanedUp)
             {
                 throw new ObjectDisposedException(this.GetType().FullName);
@@ -1358,18 +1333,6 @@ namespace System.Net.Sockets
                 _rightEndPoint = endPointSnapshot;
             }
 
-            if (s_perfCountersEnabled)
-            {
-                if (bytesTransferred > 0)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesSent, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsSent);
-                    }
-                }
-            }
-
             if (NetEventSource.IsEnabled)
             {
                 NetEventSource.DumpBuffer(this, buffer, offset, size);
@@ -1462,20 +1425,6 @@ namespace System.Net.Sockets
                 return 0;
             }
 
-            if (s_perfCountersEnabled)
-            {
-                bool peek = ((int)socketFlags & (int)SocketFlags.Peek) != 0;
-
-                if (bytesTransferred > 0 && !peek)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesReceived, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsReceived);
-                    }
-                }
-            }
-
             if (NetEventSource.IsEnabled)
             {
 #if TRACE_VERBOSE
@@ -1587,20 +1536,6 @@ namespace System.Net.Sockets
                 return 0;
             }
 
-            if (s_perfCountersEnabled)
-            {
-                bool peek = ((int)socketFlags & (int)SocketFlags.Peek) != 0;
-
-                if (bytesTransferred > 0 && !peek)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesReceived, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsReceived);
-                    }
-                }
-            }
-
 #if TRACE_VERBOSE
             if (NetEventSource.IsEnabled)
             {
@@ -1782,18 +1717,6 @@ namespace System.Net.Sockets
                 throw socketException;
             }
 
-            if (s_perfCountersEnabled)
-            {
-                if (bytesTransferred > 0)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesReceived, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsReceived);
-                    }
-                }
-            }
-
             if (NetEventSource.IsEnabled)
             {
                 NetEventSource.DumpBuffer(this, buffer, offset, size);
@@ -1828,7 +1751,7 @@ namespace System.Net.Sockets
             int realOptionLength = 0;
 
             // IOControl is used for Windows-specific IOCTL operations.  If we need to add support for IOCTLs specific
-            // to other platforms, we will likely need to add a new API, as the control codes may overlap with those 
+            // to other platforms, we will likely need to add a new API, as the control codes may overlap with those
             // from Windows.  Generally it would be preferable to add new methods/properties to abstract these across
             // platforms, however.
             SocketError errorCode = SocketPal.WindowsIoctl(_handle, ioControlCode, optionInValue, optionOutValue, out realOptionLength);
@@ -1973,7 +1896,7 @@ namespace System.Net.Sockets
                 out optionValue);
 
             if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"Interop.Winsock.getsockopt returns errorCode:{errorCode}");
-        
+
             // Throw an appropriate SocketException if the native call fails.
             if (errorCode != SocketError.Success)
             {
@@ -2119,17 +2042,17 @@ namespace System.Net.Sockets
         }
 
         // Routine Description:
-        // 
+        //
         //    BeginConnect - Does an async connect.
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    remoteEP - status line that we wish to parse
         //    Callback - Async Callback Delegate that is called upon Async Completion
         //    State - State used to track callback, set by caller, not required
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    IAsyncResult - Async result used to retrieve result
         public IAsyncResult BeginConnect(EndPoint remoteEP, AsyncCallback callback, object state)
         {
@@ -2178,7 +2101,7 @@ namespace System.Net.Sockets
         {
             //
             // On Windows, we cannot duplicate a socket that is bound to an IOCP.  In this implementation, we *only*
-            // support IOCPs, so this will not work.  
+            // support IOCPs, so this will not work.
             //
             // On Unix, duplication of a socket into an arbitrary process is not supported at all.
             //
@@ -2409,16 +2332,16 @@ namespace System.Net.Sockets
         }
 
         // Routine Description:
-        // 
+        //
         //    EndConnect - Called after receiving callback from BeginConnect,
         //     in order to retrieve the result of async call
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    AsyncResult - the AsyncResult Returned from BeginConnect call
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    int - Return code from async Connect, 0 for success, SocketError.NotConnected otherwise
         public void EndConnect(IAsyncResult asyncResult)
         {
@@ -2544,21 +2467,21 @@ namespace System.Net.Sockets
         }
 
         // Routine Description:
-        // 
+        //
         //    BeginSend - Async implementation of Send call, mirrored after BeginReceive
         //    This routine may go pending at which time,
         //    but any case the callback Delegate will be called upon completion
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    WriteBuffer - status line that we wish to parse
         //    Index - Offset into WriteBuffer to begin sending from
         //    Size - Size of Buffer to transmit
         //    Callback - Delegate function that holds callback, called on completion of I/O
         //    State - State used to track callback, set by caller, not required
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    IAsyncResult - Async result used to retrieve result
         public IAsyncResult BeginSend(byte[] buffer, int offset, int size, SocketFlags socketFlags, AsyncCallback callback, object state)
         {
@@ -2626,7 +2549,7 @@ namespace System.Net.Sockets
 
             if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"Interop.Winsock.WSASend returns:{errorCode} size:{size} returning AsyncResult:{asyncResult}");
 
-            // If the call failed, update our status 
+            // If the call failed, update our status
             CheckErrorAndUpdateStatus(errorCode);
 
             return errorCode;
@@ -2691,23 +2614,23 @@ namespace System.Net.Sockets
 
             if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"Interop.Winsock.WSASend returns:{errorCode} returning AsyncResult:{asyncResult}");
 
-            // If the call failed, update our status 
+            // If the call failed, update our status
             CheckErrorAndUpdateStatus(errorCode);
 
             return errorCode;
         }
 
         // Routine Description:
-        // 
+        //
         //    EndSend -  Called by user code after I/O is done or the user wants to wait.
         //                 until Async completion, needed to retrieve error result from call
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    AsyncResult - the AsyncResult Returned from BeginSend call
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    int - Number of bytes transferred
         public int EndSend(IAsyncResult asyncResult)
         {
@@ -2747,18 +2670,6 @@ namespace System.Net.Sockets
             int bytesTransferred = castedAsyncResult.InternalWaitForCompletionInt32Result();
             castedAsyncResult.EndCalled = true;
 
-            if (s_perfCountersEnabled)
-            {
-                if (bytesTransferred > 0)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesSent, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsSent);
-                    }
-                }
-            }
-
             if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"bytesTransffered:{bytesTransferred}");
 
             // Throw an appropriate SocketException if the native call failed asynchronously.
@@ -2826,14 +2737,14 @@ namespace System.Net.Sockets
         }
 
         // Routine Description:
-        // 
+        //
         //    BeginSendTo - Async implementation of SendTo,
-        // 
+        //
         //    This routine may go pending at which time,
         //    but any case the callback Delegate will be called upon completion
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    WriteBuffer - Buffer to transmit
         //    Index - Offset into WriteBuffer to begin sending from
         //    Size - Size of Buffer to transmit
@@ -2841,9 +2752,9 @@ namespace System.Net.Sockets
         //    remoteEP - EndPoint to transmit To
         //    Callback - Delegate function that holds callback, called on completion of I/O
         //    State - State used to track callback, set by caller, not required
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    IAsyncResult - Async result used to retrieve result
         public IAsyncResult BeginSendTo(byte[] buffer, int offset, int size, SocketFlags socketFlags, EndPoint remoteEP, AsyncCallback callback, object state)
         {
@@ -2927,16 +2838,16 @@ namespace System.Net.Sockets
         }
 
         // Routine Description:
-        // 
+        //
         //    EndSendTo -  Called by user code after I/O is done or the user wants to wait.
         //                 until Async completion, needed to retrieve error result from call
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    AsyncResult - the AsyncResult Returned from BeginSend call
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    int - Number of bytes transferred
         public int EndSendTo(IAsyncResult asyncResult)
         {
@@ -2966,18 +2877,6 @@ namespace System.Net.Sockets
             int bytesTransferred = castedAsyncResult.InternalWaitForCompletionInt32Result();
             castedAsyncResult.EndCalled = true;
 
-            if (s_perfCountersEnabled)
-            {
-                if (bytesTransferred > 0)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesSent, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsSent);
-                    }
-                }
-            }
-
             if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"bytesTransferred:{bytesTransferred}");
 
             // Throw an appropriate SocketException if the native call failed asynchronously.
@@ -2991,26 +2890,26 @@ namespace System.Net.Sockets
         }
 
         // Routine Description:
-        // 
+        //
         //    BeginReceive - Async implementation of Recv call,
-        // 
+        //
         //    Called when we want to start an async receive.
         //    We kick off the receive, and if it completes synchronously we'll
         //    call the callback. Otherwise we'll return an IASyncResult, which
         //    the caller can use to wait on or retrieve the final status, as needed.
-        // 
+        //
         //    Uses Winsock 2 overlapped I/O.
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    ReadBuffer - status line that we wish to parse
         //    Index - Offset into ReadBuffer to begin reading from
         //    Size - Size of Buffer to recv
         //    Callback - Delegate function that holds callback, called on completion of I/O
         //    State - State used to track callback, set by caller, not required
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    IAsyncResult - Async result used to retrieve result
         public IAsyncResult BeginReceive(byte[] buffer, int offset, int size, SocketFlags socketFlags, AsyncCallback callback, object state)
         {
@@ -3152,7 +3051,7 @@ namespace System.Net.Sockets
             SocketError errorCode = SocketPal.ReceiveAsync(_handle, buffers, socketFlags, asyncResult);
 
             if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"Interop.Winsock.WSARecv returns:{errorCode} returning AsyncResult:{asyncResult}");
- 
+
             if (!CheckErrorAndUpdateStatus(errorCode))
             {
             }
@@ -3175,17 +3074,17 @@ namespace System.Net.Sockets
 #endif
 
         // Routine Description:
-        // 
+        //
         //    EndReceive -  Called when I/O is done or the user wants to wait. If
         //              the I/O isn't done, we'll wait for it to complete, and then we'll return
         //              the bytes of I/O done.
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    AsyncResult - the AsyncResult Returned from BeginSend call
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    int - Number of bytes transferred
         public int EndReceive(IAsyncResult asyncResult)
         {
@@ -3226,18 +3125,6 @@ namespace System.Net.Sockets
             int bytesTransferred = castedAsyncResult.InternalWaitForCompletionInt32Result();
             castedAsyncResult.EndCalled = true;
 
-            if (s_perfCountersEnabled)
-            {
-                if (bytesTransferred > 0)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesReceived, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsReceived);
-                    }
-                }
-            }
-
 #if TRACE_VERBOSE
             if (NetEventSource.IsEnabled)
             {
@@ -3436,18 +3323,6 @@ namespace System.Net.Sockets
                 }
             }
 
-            if (s_perfCountersEnabled)
-            {
-                if (bytesTransferred > 0)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesReceived, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsReceived);
-                    }
-                }
-            }
-
             if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"bytesTransferred:{bytesTransferred}");
 
             // Throw an appropriate SocketException if the native call failed asynchronously.
@@ -3464,18 +3339,18 @@ namespace System.Net.Sockets
         }
 
         // Routine Description:
-        // 
+        //
         //    BeginReceiveFrom - Async implementation of RecvFrom call,
-        // 
+        //
         //    Called when we want to start an async receive.
         //    We kick off the receive, and if it completes synchronously we'll
         //    call the callback. Otherwise we'll return an IASyncResult, which
         //    the caller can use to wait on or retrieve the final status, as needed.
-        // 
+        //
         //    Uses Winsock 2 overlapped I/O.
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    ReadBuffer - status line that we wish to parse
         //    Index - Offset into ReadBuffer to begin reading from
         //    Request - Size of Buffer to recv
@@ -3483,9 +3358,9 @@ namespace System.Net.Sockets
         //    remoteEP - EndPoint that are to receive from
         //    Callback - Delegate function that holds callback, called on completion of I/O
         //    State - State used to track callback, set by caller, not required
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    IAsyncResult - Async result used to retrieve result
         public IAsyncResult BeginReceiveFrom(byte[] buffer, int offset, int size, SocketFlags socketFlags, ref EndPoint remoteEP, AsyncCallback callback, object state)
         {
@@ -3596,17 +3471,17 @@ namespace System.Net.Sockets
         }
 
         // Routine Description:
-        // 
+        //
         //    EndReceiveFrom -  Called when I/O is done or the user wants to wait. If
         //              the I/O isn't done, we'll wait for it to complete, and then we'll return
         //              the bytes of I/O done.
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    AsyncResult - the AsyncResult Returned from BeginReceiveFrom call
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    int - Number of bytes transferred
         public int EndReceiveFrom(IAsyncResult asyncResult, ref EndPoint endPoint)
         {
@@ -3660,18 +3535,6 @@ namespace System.Net.Sockets
                 }
             }
 
-            if (s_perfCountersEnabled)
-            {
-                if (bytesTransferred > 0)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesReceived, bytesTransferred);
-                    if (Transport == TransportType.Udp)
-                    {
-                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsReceived);
-                    }
-                }
-            }
-
             if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"bytesTransferred:{bytesTransferred}");
 
             // Throw an appropriate SocketException if the native call failed asynchronously.
@@ -3684,22 +3547,22 @@ namespace System.Net.Sockets
         }
 
         // Routine Description:
-        // 
+        //
         //    BeginAccept - Does an async winsock accept, creating a new socket on success
-        // 
+        //
         //     Works by creating a pending accept request the first time,
         //     and subsequent calls are queued so that when the first accept completes,
         //     the next accept can be resubmitted in the callback.
         //     this routine may go pending at which time,
         //     but any case the callback Delegate will be called upon completion
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    Callback - Async Callback Delegate that is called upon Async Completion
         //    State - State used to track callback, set by caller, not required
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    IAsyncResult - Async result used to retrieve resultant new socket
         public IAsyncResult BeginAccept(AsyncCallback callback, object state)
         {
@@ -3778,17 +3641,17 @@ namespace System.Net.Sockets
         }
 
         // Routine Description:
-        // 
+        //
         //    EndAccept -  Called by user code after I/O is done or the user wants to wait.
         //                 until Async completion, so it provides End handling for async Accept calls,
         //                 and retrieves new Socket object
-        // 
+        //
         // Arguments:
-        // 
+        //
         //    AsyncResult - the AsyncResult Returned from BeginAccept call
-        // 
+        //
         // Return Value:
-        // 
+        //
         //    Socket - a valid socket if successful
         public Socket EndAccept(IAsyncResult asyncResult)
         {
@@ -3837,14 +3700,6 @@ namespace System.Net.Sockets
 
             castedAsyncResult.EndCalled = true;
 
-            if (s_perfCountersEnabled)
-            {
-                if (bytesTransferred > 0)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesReceived, bytesTransferred);
-                }
-            }
-
             // Throw an appropriate SocketException if the native call failed asynchronously.
             if ((SocketError)castedAsyncResult.ErrorCode != SocketError.Success)
             {
@@ -4025,7 +3880,7 @@ namespace System.Net.Sockets
                     }
                 }
 
-                // Save the old RightEndPoint and prep new RightEndPoint.           
+                // Save the old RightEndPoint and prep new RightEndPoint.
                 EndPoint oldEndPoint = _rightEndPoint;
                 if (_rightEndPoint == null)
                 {
@@ -4046,7 +3901,7 @@ namespace System.Net.Sockets
                 {
                     _rightEndPoint = oldEndPoint;
 
-                    // Clear in-use flag on event args object. 
+                    // Clear in-use flag on event args object.
                     e.Complete();
                     throw;
                 }
@@ -4085,7 +3940,7 @@ namespace System.Net.Sockets
                 MultipleConnectAsync multipleConnectAsync = null;
                 if (dnsEP.AddressFamily == AddressFamily.Unspecified)
                 {
-                    // This is the only *Connect* API that fully supports multiple endpoint attempts, as it's responsible 
+                    // This is the only *Connect* API that fully supports multiple endpoint attempts, as it's responsible
                     // for creating each Socket instance and can create one per attempt.
                     multipleConnectAsync = new DualSocketMultipleConnectAsync(socketType, protocolType);
 #pragma warning restore
@@ -4141,7 +3996,7 @@ namespace System.Net.Sockets
             }
             catch
             {
-                // clear in-use on event arg object 
+                // clear in-use on event arg object
                 e.Complete();
                 throw;
             }
@@ -4180,7 +4035,7 @@ namespace System.Net.Sockets
             }
             catch
             {
-                // Clear in-use flag on event args object. 
+                // Clear in-use flag on event args object.
                 e.Complete();
                 throw;
             }
@@ -4220,7 +4075,7 @@ namespace System.Net.Sockets
             EndPoint endPointSnapshot = e.RemoteEndPoint;
             e._socketAddress = SnapshotAndSerialize(ref endPointSnapshot);
 
-            // DualMode sockets may have updated the endPointSnapshot, and it has to have the same AddressFamily as 
+            // DualMode sockets may have updated the endPointSnapshot, and it has to have the same AddressFamily as
             // e.m_SocketAddres for Create to work later.
             e.RemoteEndPoint = endPointSnapshot;
 
@@ -4238,7 +4093,7 @@ namespace System.Net.Sockets
             }
             catch
             {
-                // Clear in-use flag on event args object. 
+                // Clear in-use flag on event args object.
                 e.Complete();
                 throw;
             }
@@ -4278,7 +4133,7 @@ namespace System.Net.Sockets
             EndPoint endPointSnapshot = e.RemoteEndPoint;
             e._socketAddress = SnapshotAndSerialize(ref endPointSnapshot);
 
-            // DualMode may have updated the endPointSnapshot, and it has to have the same AddressFamily as 
+            // DualMode may have updated the endPointSnapshot, and it has to have the same AddressFamily as
             // e.m_SocketAddres for Create to work later.
             e.RemoteEndPoint = endPointSnapshot;
 
@@ -4297,7 +4152,7 @@ namespace System.Net.Sockets
             }
             catch
             {
-                // Clear in-use flag on event args object. 
+                // Clear in-use flag on event args object.
                 e.Complete();
                 throw;
             }
@@ -4335,7 +4190,7 @@ namespace System.Net.Sockets
             }
             catch
             {
-                // Clear in-use flag on event args object. 
+                // Clear in-use flag on event args object.
                 e.Complete();
                 throw;
             }
@@ -4385,7 +4240,7 @@ namespace System.Net.Sockets
                 }
                 catch (Exception)
                 {
-                    // Clear in-use flag on event args object. 
+                    // Clear in-use flag on event args object.
                     e.Complete();
                     throw;
                 }
@@ -4438,7 +4293,7 @@ namespace System.Net.Sockets
             }
             catch
             {
-                // Clear in-use flag on event args object. 
+                // Clear in-use flag on event args object.
                 e.Complete();
                 throw;
             }
@@ -5090,7 +4945,7 @@ namespace System.Net.Sockets
         {
             private EndPoint _endPoint;
 
-            internal ConnectAsyncResult(object myObject, EndPoint endPoint, object myState, AsyncCallback myCallBack) : 
+            internal ConnectAsyncResult(object myObject, EndPoint endPoint, object myState, AsyncCallback myCallBack) :
                 base(myObject, myState, myCallBack)
             {
                 _endPoint = endPoint;
@@ -5296,10 +5151,6 @@ namespace System.Net.Sockets
             _isConnected = true;
             _isDisconnected = false;
             if (NetEventSource.IsEnabled) NetEventSource.Info(this, "now connected");
-            if (s_perfCountersEnabled)
-            {
-                SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketConnectionsEstablished);
-            }
         }
 
         internal void SetToDisconnected()
diff --git a/src/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEventArgs.cs b/src/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEventArgs.cs
index 5b5eb8c38d..9f0eabd5a5 100644
--- a/src/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEventArgs.cs
+++ b/src/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEventArgs.cs
@@ -131,7 +131,7 @@ namespace System.Net.Sockets
         }
 
         // NOTE: this property is mutually exclusive with Buffer.
-        // Setting this property with an existing non-null Buffer will throw.    
+        // Setting this property with an existing non-null Buffer will throw.
         public IList<ArraySegment<byte>> BufferList
         {
             get { return _bufferList; }
@@ -172,7 +172,7 @@ namespace System.Net.Sockets
                     {
                         _bufferListInternal?.Clear();
                     }
-                    
+
                     _bufferList = value;
 
                     SetupMultipleBuffers();
@@ -329,7 +329,7 @@ namespace System.Net.Sockets
                         throw new ArgumentException(SR.Format(SR.net_ambiguousbuffers, nameof(BufferList)));
                     }
 
-                    // Offset and count can't be negative and the 
+                    // Offset and count can't be negative and the
                     // combination must be in bounds of the array.
                     if (offset < 0 || offset > buffer.Length)
                     {
@@ -393,14 +393,14 @@ namespace System.Net.Sockets
         }
 
         // Marks this object as no longer "in-use". Will also execute a Dispose deferred
-        // because I/O was in progress.  
+        // because I/O was in progress.
         internal void Complete()
         {
             // Mark as not in-use.
             _operating = Free;
 
             // Check for deferred Dispose().
-            // The deferred Dispose is not guaranteed if Dispose is called while an operation is in progress. 
+            // The deferred Dispose is not guaranteed if Dispose is called while an operation is in progress.
             // The _disposeCalled variable is not managed in a thread-safe manner on purpose for performance.
             if (_disposeCalled)
             {
@@ -499,7 +499,7 @@ namespace System.Net.Sockets
 
             // If our caller specified a buffer (willing to get received data with the Accept) then
             // it needs to be large enough for the two special sockaddr buffers that AcceptEx requires.
-            // Throw if that buffer is not large enough.  
+            // Throw if that buffer is not large enough.
             bool userSuppliedBuffer = _buffer != null;
             if (userSuppliedBuffer)
             {
@@ -612,26 +612,6 @@ namespace System.Net.Sockets
             InnerStartOperationSendTo();
         }
 
-        internal void UpdatePerfCounters(int size, bool sendOp)
-        {
-            if (sendOp)
-            {
-                SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesSent, size);
-                if (_currentSocket.Transport == TransportType.Udp)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsSent);
-                }
-            }
-            else
-            {
-                SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesReceived, size);
-                if (_currentSocket.Transport == TransportType.Udp)
-                {
-                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsReceived);
-                }
-            }
-        }
-
         internal void FinishOperationSyncFailure(SocketError socketError, int bytesTransferred, SocketFlags flags)
         {
             SetResults(socketError, bytesTransferred, flags);
@@ -710,7 +690,7 @@ namespace System.Net.Sockets
         {
             SetResults(SocketError.Success, bytesTransferred, flags);
 
-            if (NetEventSource.IsEnabled || Socket.s_perfCountersEnabled)
+            if (NetEventSource.IsEnabled)
             {
                 LogBytesTransferred(bytesTransferred, _completedOperation);
             }
@@ -810,21 +790,6 @@ namespace System.Net.Sockets
                 {
                     LogBuffer(bytesTransferred);
                 }
-
-                if (Socket.s_perfCountersEnabled)
-                {
-                    bool sendOp = false;
-                    switch (operation)
-                    {
-                        case SocketAsyncOperation.Connect:
-                        case SocketAsyncOperation.Send:
-                        case SocketAsyncOperation.SendPackets:
-                        case SocketAsyncOperation.SendTo:
-                            sendOp = true;
-                            break;
-                    }
-                    UpdatePerfCounters(bytesTransferred, sendOp);
-                }
             }
         }