Increase the min max queue size to match 7 and 8

Author: amcasey

src/Servers/Kestrel/Core/src/Internal/Http2/Http2Connection.cs

@@ -189,10 +189,11 @@ public Http2Connection(HttpConnectionContext context)
                 ? 4 * http2Limits.MaxStreamsPerConnection // 4 is a magic number to give us some padding above the expected maximum size
                 : (int)ConfiguredMaximumFlowControlQueueSize;
 
-            if (IsMaximumFlowControlQueueSizeEnabled && _maximumFlowControlQueueSize < http2Limits.MaxStreamsPerConnection)
+            var minimumMaximumFlowControlQueueSize = 2 * http2Limits.MaxStreamsPerConnection; // Double to match 7.0 and 8.0
+            if (IsMaximumFlowControlQueueSizeEnabled && _maximumFlowControlQueueSize < minimumMaximumFlowControlQueueSize)
             {
-                Log.Http2FlowControlQueueMaximumTooLow(context.ConnectionId, http2Limits.MaxStreamsPerConnection, _maximumFlowControlQueueSize);
-                _maximumFlowControlQueueSize = http2Limits.MaxStreamsPerConnection;
+                Log.Http2FlowControlQueueMaximumTooLow(context.ConnectionId, minimumMaximumFlowControlQueueSize, _maximumFlowControlQueueSize);
+                _maximumFlowControlQueueSize = minimumMaximumFlowControlQueueSize;
             }
 
             // Start pool off at a smaller size if the max number of streams is less than the InitialStreamPoolSize

src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.cs

@@ -411,7 +411,7 @@ public void Http2FlowControlQueueOperationsExceeded(string connectionId, int cou
             Http2FlowControlQueueOperationsExceeded(_http3Logger, connectionId, count);
         }
 
-        [LoggerMessage(56, LogLevel.Debug, @"Connection id ""{ConnectionId}"" configured maximum flow control queue size {Actual} is less than the maximum streams per connection {Expected}. Increasing configured value to {Expected}.", EventName = "Http2FlowControlQueueMaximumTooLow")]
+        [LoggerMessage(56, LogLevel.Debug, @"Connection id ""{ConnectionId}"" configured maximum flow control queue size {Actual} is less than double the maximum streams per connection {Expected}. Increasing configured value to {Expected}.", EventName = "Http2FlowControlQueueMaximumTooLow")]
         private static partial void Http2FlowControlQueueMaximumTooLow(ILogger logger, string connectionId, int expected, int actual);
 
         public void Http2FlowControlQueueMaximumTooLow(string connectionId, int expected, int actual)