Date: Mon, 28 Jul 2003 23:29:39 +0200
From: Wiktor Wodecki <wodecki@gmx.de>
To: Andrew Morton <akpm@osdl.org>
Cc: Valdis.Kletnieks@vt.edu, kernel@kolivas.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] O10int for interactivity
Message-ID: <20030728212939.GB6798@gmx.de>
Reply-To: Johoho <johoho@hojo-net.de>
References: <200307280112.16043.kernel@kolivas.org> <200307281808.h6SI8C5k004439@turing-police.cc.vt.edu> <20030728114041.2c8ce156.akpm@osdl.org>
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On Mon, Jul 28, 2003 at 11:40:41AM -0700, Andrew Morton wrote:
> Valdis.Kletnieks@vt.edu wrote:
> >
> > I am, however, able to get 'xmms' to skip.  The reason is that the CPU =
is being
> >  scheduled quite adequately, but I/O is *NOT*.
> >=20
> > ...
> >  I'm guessing that the anticipatory scheduler is the culprit here.  Soo=
n as I figure
> >  out the incantations to use the deadline scheduler, I'll report back..=
=2E.
>=20
> Try decreasing the expiry times in /sys/block/hda/queue/iosched:
>=20
> read_batch_expire
> read_expire
> write_batch_expire
> write_expire

I noticed that when bringing a huge application out of swap (mozilla,
openoffice, also tested the gimp with 50 images open) that dividing
everything by 2 in those 4 files I get a decent process fork. Without
this tuning the fork (xterm) waits till the application is back up.

--=20
Regards,

Wiktor Wodecki

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