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List:       linux-kernel
Subject:    Re: Kernel 2.6.8.1: swap storm of death - CFQ scheduler=culprit
From:       Jens Axboe <axboe () suse ! de>
Date:       2004-08-24 10:13:53
Message-ID: 20040824101352.GJ2355 () suse ! de
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On Tue, Aug 24 2004, Jens Axboe wrote:
> On Mon, Aug 23 2004, Karl Vogel wrote:
> > > > Jens, is this huge amount of bio/biovec's allocations 
> > > expected with CFQ? Its really really bad.
> > > 
> > > Nope, it's not by design :-)
> > > 
> > > A test case would be nice, then I'll fix it as soon as possible. But
> > > please retest with 2.6.8.1 marcelo, 2.6.8-rc4 is missing an important
> > > fix to ll_rw_blk that can easily cause this. The first report is for
> > > 2.6.8.1, so I'm more puzzled on that.
> > 
> > I tried with 2.6.8.1 and 2.6.8.1-mm4, both had the problem. If there 
> > is anything extra I need to try/record, just shoot!
> > 
> > Original post with testcase + stats:
> >   http://article.gmane.org/gmane.linux.kernel/228156
> 
> 2.6.8.1-mm4 clean does not reproduce the problem. Marcelo, your
> 2.6.8-rc4 report is not valid due to the fixed problem related to that
> in CFQ already. I'd still like for you to retest with 2.6.8.1.
> 
> So I'm trying 2.6.8.1 with voluntary preempt applied now, the bug could
> be related to that.

Oh, and please do also do a sysrq-t from a hung box and save the output.

-- 
Jens Axboe

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