From: Aaron Porter <atporter@primate.net>
To: linux-kernel@vger.kernel.org
Subject: miserable performance of 2.6.21 under network load
Date: Tue, 24 Jul 2007 10:25:14 -0700 [thread overview]
Message-ID: <20070724172513.GB24543@primate.net> (raw)
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.
next reply other threads:[~2007-07-24 17:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-24 17:25 Aaron Porter [this message]
2007-07-24 18:48 ` miserable performance of 2.6.21 under network load Andi Kleen
2007-07-24 18:49 ` Aaron Porter
2007-07-24 19:13 ` Jeff Garzik
2007-07-24 19:13 ` Andi Kleen
2007-07-24 20:41 ` Aaron Porter
2007-07-24 19:22 ` Chris Snook
2007-07-24 19:45 ` David Miller
2007-07-24 18:49 ` Chris Snook
2007-07-24 18:53 ` Aaron Porter
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