Report available inbound bytes on socket

StackExchange.Redis/StackExchange/Redis/ConnectionMultiplexer.cs

@@ -1702,13 +1702,15 @@ internal T ExecuteSyncImpl<T>(Message message, ResultProcessor<T> processor, Ser
                         }
                         else
                         {
-                            int inst, qu, qs, qc, wr, wq;
-                            int queue = server.GetOutstandingCount(message.Command, out inst, out qu, out qs, out qc, out wr, out wq);
+                            int inst, qu, qs, qc, wr, wq, @in;
+                            int queue = server.GetOutstandingCount(message.Command, out inst, out qu, out qs, out qc, out wr, out wq, out @in);
                             var sb = new StringBuilder("Timeout performing ").Append(message.CommandAndKey)
                                 .Append(", inst: ").Append(inst)
                                 .Append(", queue: ").Append(queue).Append(", qu=").Append(qu)
                                 .Append(", qs=").Append(qs).Append(", qc=").Append(qc)
-                                .Append(", wr=").Append(wr).Append("/").Append(wq);
+                                .Append(", wr=").Append(wr).Append("/").Append(wq)
+                                .Append(", in=").Append(@in);
+
                             errMessage = sb.ToString();
                             if (stormLogThreshold >= 0 && queue >= stormLogThreshold && Interlocked.CompareExchange(ref haveStormLog, 1, 0) == 0)
                             {

StackExchange.Redis/StackExchange/Redis/PhysicalBridge.cs

@@ -209,12 +209,19 @@ internal void GetCounters(ConnectionCounters counters)
             }
         }
 
-        internal int GetOutstandingCount(out int inst, out int qu, out int qs, out int qc, out int wr, out int wq)
+        internal int GetOutstandingCount(out int inst, out int qu, out int qs, out int qc, out int wr, out int wq, out int @in)
         {// defined as: PendingUnsentItems + SentItemsAwaitingResponse + ResponsesAwaitingAsyncCompletion
             inst = (int)(Interlocked.Read(ref operationCount) - Interlocked.Read(ref profileLastLog));
             qu = queue.Count();
             var tmp = physical;
-            qs = tmp == null ? 0 : tmp.GetSentAwaitingResponseCount();
+            if(tmp == null)
+            {
+                qs = @in = 0;
+            } else
+            {
+                qs = tmp.GetSentAwaitingResponseCount();
+                @in = tmp.GetAvailableInboundBytes();
+            }
             qc = completionManager.GetOutstandingCount();
             wr = Interlocked.CompareExchange(ref activeWriters, 0, 0);
             wq = Interlocked.CompareExchange(ref inWriteQueue, 0, 0);

StackExchange.Redis/StackExchange/Redis/PhysicalConnection.cs

@@ -513,6 +513,11 @@ void BeginReading()
             } while (keepReading);
         }
 
+        internal int GetAvailableInboundBytes()
+        {
+            return this.socketToken.Available;
+        }
+
         SocketMode ISocketCallback.Connected(Stream stream)
         {
             try

StackExchange.Redis/StackExchange/Redis/ServerEndPoint.cs

@@ -329,15 +329,15 @@ internal ServerCounters GetCounters()
             return counters;
         }
 
-        internal int GetOutstandingCount(RedisCommand command, out int inst, out int qu, out int qs, out int qc, out int wr, out int wq)
+        internal int GetOutstandingCount(RedisCommand command, out int inst, out int qu, out int qs, out int qc, out int wr, out int wq, out int @in)
         {
             var bridge = GetBridge(command, false);
             if (bridge == null)
             {
-                return inst = qu = qs = qc = wr = wq = 0;
+                return inst = qu = qs = qc = wr = wq = @in = 0;
             }
 
-            return bridge.GetOutstandingCount(out inst, out qu, out qs, out qc, out wr, out wq);
+            return bridge.GetOutstandingCount(out inst, out qu, out qs, out qc, out wr, out wq, out @in);
         }
 
         internal string GetProfile()