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From Bill Stoddard <>
Subject Re: keepalivetimeout and 2.2 configs
Date Mon, 11 Apr 2005 12:20:45 GMT
Rich Bowen wrote:
> While the 2.2 config files are somewhat in flux, I thought I'd bring up
> the topic of KeepAliveTimeout. The default config files have this set to
> 15 seconds. As far as I remember, it is set that way due to some
> possibly-scientific survey that said that "average" web users click ever
> 15 seconds. Even assuming that that was true at some point, it seems to
> me that the main reason for keepalive is for the files (images, css)
> associated with a single page, not for retaining a connection between
> pages. In that case, I would think that 2, or perhaps 3 seconds, would
> be more than sufficient.
> On the more practical non-gut-feeling side, I've found consistently that
> changing KeepAliveTimeout from 15 to 3 immediately, and drastically,
> reduces server load on busy servers, where a significant percentage of
> the child processes are in Keepalive mode most of the time.
> See for an example. Note that
> (most of the time) most of the processes are in K. I'm willing to bet
> that reducing KeepAliveTimeout to 2 or 3 will drop the number of child
> processes significantly, reduce overall server load, and improve server
> performance under peak traffic.
> Thoughts?
> --Rich

Joshua picked the important nits.. I am generally +1 on setting default KA timeout from 15
to 5.


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