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Message-ID: <p73vec9sknz.fsf@bingen.suse.de> Date: 24 Jul 2007 20:48:00 +0200 From: Andi Kleen <andi@...stfloor.org> To: Aaron Porter <atporter@...mate.net> Cc: linux-kernel@...r.kernel.org Subject: Re: miserable performance of 2.6.21 under network load Aaron Porter <atporter@...mate.net> writes: > 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. Can you oprofile it? -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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