Messages in this thread | | | Subject | Re: miserable performance of 2.6.21 under network load | From | Andi Kleen <> | Date | 24 Jul 2007 20:48:00 +0200 |
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Aaron Porter <atporter@primate.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?
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