From: Con Kolivas <kernel@kolivas.org>
To: Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
Subject: Re: 2.6.7-ck1
Date: Sat, 19 Jun 2004 13:48:57 +1000
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On Sat, 19 Jun 2004 02:28, Felipe Alfaro Solana wrote:
> On Wed, 2004-06-16 at 21:22 +1000, Con Kolivas wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > Patchset update. The focus of this patchset is on system responsiveness
> > with emphasis on desktops, but the scope of scheduler changes now makes
> > this patch suitable to servers as well.
>
> I've found some interaction problems between, what I think it's, the
> staircase scheduler and swsusp. With vanilla 2.6.7, swsusp is able to
> save ~9000 pages to disk in less than 5 seconds, where as 2.6.7-ck1
> takes more than 1 minute to save the same amount of pages when
> suspending to disk.

If you're using -ck1 it may even be the autoswappiness. Try disabling that and 
setting a static value for swappiness. If it still exhibits the problem then 
it's probably a bug somewhere in staircase. While the overall design is 
finished (it doesn't really lend itself to tuning), surely there are bugs I 
haven't sorted out even though there are no serious bugs or stability issues 
that have come up. I'm auditing the code as we speak.

Thanks.
Con
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