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List:       linux-kernel
Subject:    Re: [patch] voluntary-preempt-2.6.8.1-P4
From:       Ingo Molnar <mingo () elte ! hu>
Date:       2004-08-20 8:13:19
Message-ID: 20040820081319.GA4321 () elte ! hu
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* Lee Revell <rlrevell@joe-job.com> wrote:

> >   http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P4
> 
> I think I am seeing those weird ~1 ms latencies still (actually I am not
> sure I saw before now):
> 
> http://krustophenia.net/testresults.php?dataset=2.6.8.1-P4#/var/www/2.6.8.1-P4/kswapd_latency_trace.txt

this is a 9 msec latency in fact. I know what's going on - it's the
get_swap_page() locking - i looked at it once already but there's no
immediate silver arrow. As we allocate more and more swap entries the
longer the scan gets.

	Ingo
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