Date: Mon, 18 Aug 2003 21:49:02 +0200
From: Stefan Foerster <stefan@stefan-foerster.de>
To: "Justin T. Gibbs" <gibbs@scsiguy.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Very bad interactivity with 2.6.0 and SCSI disks (aic7xxx)
Message-ID: <20030818194902.GB1589@in-ws-001.cid-net.de>
References: <20030818013243.GB21665@in-ws-001.cid-net.de> <1294265408.1061233452@aslan.btc.adaptec.com>
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* "Justin T. Gibbs" <gibbs@scsiguy.com> wrote:
>> But as soon as I do a
>> 
>> while true; do dd if=/dev/zero of=test bs=1024 count=1048576 ; rm test
>> ; done
>> 
>> on my SCSI disk, the system becomes completely unusuable after a few
>> seconds. Everything is running at the speed of molasses, even screen
>> redrawing, the music stops playing for some seconds, my mouse hangs
>> and so on.
> 
> It sounds like the system is not limiting the rate at which an I/O
> hog can dirty pages, so this one process ends up consuming all of
> your I/O bandwidth.

Well, this is not the desired behaviour, at least not for me. Any
ideas what I could do to solve this problem? I sent an oprofile output
to lkml, perhaps that helps?

I am more than willing to give every information needed to debug this
problem, because this bad interactive behaviuor is really annoying.

Is there a slight possibility that this problem is not specific to
2.5/2.6, because I encounter similar problems on 2.4?


Ciao,
Stefan
-- 
Stefan F?rster                                  Public Key: 0xBBE2A9E9
FdI #192: Strong international Encryption - Triple-ROT13 (Carsten Lechte)

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