Hi all, I have encountered a performance problem (high system load, slow response times) when making lots of requests that drop the TCP connection while reading the response. That is, a client reads some bytes of the response and cuts the transmission with a TCP RST.
In my tests I have used 100 concurrent clients that force the problem in an infinite loop and bring the server on his knees. In the error_log of the Apache I see lots of "(32)Broken pipe: core_output_filter: writing data to the network" errors. The number of sockets in TIME_WAIT state increases explosively. I use a relative high dimensioned Apache/2.2.17 with MPM worker on a Linux server (quad-core@2.33GHz, 8GB RAM). The most important settings are following: ------ ServerLimit 64 StartServers 32 MaxClients 1024 MinSpareThreads 512 MaxSpareThreads 512 ThreadsPerChild 16 MaxRequestsPerChild 1000000 Timeout 3 KeepAlive on MaxKeepAliveRequests 10000 KeepAliveTimeout 5 EnableSendfile Off EnableMMAP Off HostnameLookups off ------ Anyone who can confirm the problem? Is this a problem in Apache or is it related with the OS (TCP/IP stack)? Regards, Armin
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