linux-kernel - Re: sluggish system responsiveness under higher IO load

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Date:	Sun, 8 Oct 2006 19:05:38 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Christian <christiand59@....de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: sluggish system responsiveness under higher IO load

On Sun, Oct 08 2006, Christian wrote:
> Am Freitag, 6. Oktober 2006 17:58 schrieb Paolo Ornati:
> > On Sun, 13 Aug 2006 18:15:12 +0200
> >
> > Matthias Dahl <mlkernel@...tal-soul.de> wrote:
> > > Just let me know once you got them, so I can safely delete them again.
> > >
> > > At the moment, I am trying without preemption but for example doing a
> > > untar kernel sources still results in sluggish system responsiveness. :-(
> >
> > I used to have this type of problem and 2.6.19-rc1 looks much better
> > than 2.6.18.
> >
> > I'm using CONFIG_PREEMPT + CONFIG_PREEMPT_BKL, CFQ i/o scheduler
> > and /proc/sys/vm/swappiness = 20.
> 
> 
> Which change in the new kernel has made it better? I was following the lkml 
> very close and didn't see any change that could have fixed that problem.

There is a substantial CFQ update, so it could be that. Or it could be
something unrelated of course, I didn't check if eg the cpu scheduler
changed much. Or vm :-)

-- 
Jens Axboe

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