We have some RHEL7 Apache reverse proxies that experienced a performance degradation event. After a few hours, restarting Apache restored performance to normal levels. We are trying to determine the root cause of the outage.

During said investigation, I came across the following netstat numbers that I cannot find much documentation on:

  • TCPRcvCoalesce
  • TCPAutoCorking
  • TCPHystartTrainCwnd

Anyone can explain what these stats mean? Are they indicative of any particular issue?


TCPRcvCoalesce is a kernel flag that kernel can regroup packages after being received. sorry thats all I know for the moment.

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