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SubjectRe: High load under Apache1.3.3/mod_perl 1.16/Linux2.2.7 SMP
Mike Whitaker wrote:
> This is getting into heavy Linux, so I've dropped modperl from the cc: ..
You should probably cc linux-kernel from here on out.
(Original thread archived at
http://mail.nl.linux.org/lists/linuxperf/1999-05/msg00225.html )

> We're up with 2.3.3 plus Andi Kleen's tcp_do_sendmsg patch plus Apache
> sleeping in accept() on one production server, and comparing it against a
> 2.2.7 plus tcp_do_sendmsg patch plus Apache sleeping in flock(). Identical
> systems (dual PII450, 1G, two disk controllers).
>
> As far as I can *tell*, the wake-one patch is definitely doing its stuff:
> the 2.2.7 machine still has cycles of load into three figures, and the 2.3.3
> machine hasn't actully managed a load of 1 yet.
>
> UNFORTUNATELY, observation suggests that the 2.3.3 machine/Apache
> combination is dropping/ignoring about one connection in ten, maybe more.
> (Network error: connection reset by peer.)
>
> As far as I can *see* there's nothing in either Apache error log (for either
> httpd), and it is quite often missing the proxy reauest from localhost to
> localhost:8989 (proxying the mod_perl ad).
>
> Thoughts?

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