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Message-ID: <20070521081201.GB13858@elte.hu> Date: Mon, 21 May 2007 10:12:01 +0200 From: Ingo Molnar <mingo@...e.hu> To: Anant Nitya <kernel@...chanda.info> Cc: linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, "David S. Miller" <davem@...emloft.net> Subject: Re: bad networking related lag in v2.6.22-rc2 * Ingo Molnar <mingo@...e.hu> wrote: > > ouch! a nearly 1 second delay got observed by the scheduler - something > > is really killing your system! > > ah, you got the latency tracer from Thomas, as part of the -hrt patchset > - that makes it quite a bit easier to debug. [...] and ... you already did a trace for Thomas, for the softirq problem: http://cybertek.info/taitai/trace.txt.bz2 this trace shows really bad networking related kernel activities! gkrellm-5977 does this at timestamp 0: gkrellm-5977 0..s. 0us : cond_resched_softirq (established_get_next) 2 milliseconds later it's still in established_get_next() (!): gkrellm-5977 0..s. 2001us : cond_resched_softirq (established_get_next) and the whole thing takes ... 455 msecs: gkrellm-5977 0..s. 455443us+: cond_resched_softirq (established_get_next) i think this suggests that you have tons of open sockets. What does "netstat -ts" say on your box? Ingo - 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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