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* miserable performance of 2.6.21 under network load
@ 2007-07-24 17:25 Aaron Porter
  2007-07-24 18:48 ` Andi Kleen
  2007-07-24 18:49 ` Chris Snook
  0 siblings, 2 replies; 10+ messages in thread
From: Aaron Porter @ 2007-07-24 17:25 UTC (permalink / raw)
  To: linux-kernel


	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.

^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2007-07-24 20:41 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2007-07-24 17:25 miserable performance of 2.6.21 under network load Aaron Porter
2007-07-24 18:48 ` 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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