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From "pradeep kumar" <>
Subject High CPU utilization on using Apache as a reverse proxy
Date Mon, 14 Aug 2006 14:47:44 GMT

I notice there is a 100% CPU utilization which spikes for sometime and then
goes back to normalcy when Apache is used a reverse proxy. I noticed a mail
thread which seems to be a similar problem

One thread of one of the child processes hangs, calling poll() and writev()
system calls so frequently that it causes 100% CPU util. The thread is
trying to writev() to a socked which is in CLOSE_WAIT The child process ends
after time defined by ndd parameter tcp_keepalive_interval and the same
service time can be seen in access_log. The problem disappears then.



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