linux-kernel - miserable performance of 2.6.21 under network load

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Message-ID: <20070724172513.GB24543@primate.net>
Date:	Tue, 24 Jul 2007 10:25:14 -0700
From:	Aaron Porter <atporter@...mate.net>
To:	linux-kernel@...r.kernel.org
Subject: miserable performance of 2.6.21 under network load


	I'm in the process up upgrading a pool of apache servers from
2.6.17.8 to 2.6.21.5, and we're seeing a pretty major change in behavior.
Under identical network load, 2.6.21 has a load average more than 3 times
higher, cpu 0 spends well over 90% of its time in interrupts (vs ~30%
under 2.6.17). When we hit 3k apache sessions, ksoftirqd eats 100% of cpu0
and our network traffic drops off rapidly. The end result is that 2.6.17
performs twice as well under this load.
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