Message-ID: <4178AEC0.5050603@yahoo.com.au>
Date: Fri, 22 Oct 2004 16:54:56 +1000
From: Nick Piggin <nickpiggin@yahoo.com.au>
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To: Peter Zaitsev <peter@mysql.com>
CC: linux-kernel@vger.kernel.org, andrea@novell.com, alexeyk@mysql.com,
       markw@osdl.org
Subject: Re: IO performance problems with 2.6.9
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Peter Zaitsev wrote:

> 4) Unrelated but still unfortunate.  2.6.9 kernel seems to behave weird
> if swap is disabled.  I was running with 8G of memory allocating 6G for
> MySQL buffers  which left about 1.5G for kernel, 1G of which was used
> for file cache.   During IO intensive run, using buffered IO I got
> "kswapd" running like a crazy taking 90% of CPU time on one of CPUs. 
> What for is it running if there is no swap files enabled ? 
> 

Can you boot with profile=2, and get a profile of about 30 seconds
while kswapd is going crazy please?

Also capture /proc/vmstat before and after that interaval.

Can you also capture a the output of vmstat 1 while this is happening

Thanks
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