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Date: Wed, 21 Jul 2004 01:56:42 +0200
From: Dennis Berger <db@nipsi.de>
To: jesk <jesk@killall.org>
Message-ID: <20040720235642.GA42120@nipsi.home.net>
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cc: freebsd-current@freebsd.org
cc: Robert Watson <rwatson@freebsd.org>
Subject: Re: I/O or Threading Suffer
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On Wed, Jul 21, 2004 at 01:46:12AM +0200, jesk wrote:
> hi,
> i figured out that the performanceloss only really occur if the process is
> heavily writing on the filesystem.
> dd if=/dev/zero of=/dev/null bs=128k doesnt hurt much in responsetime
> of parallel processes, but when dd operates on the filesystem with of=foo
> every process will be affect in executiontime.
> a simple ps or ls meanwhile dding onto the disk will be hang for dozen of
> seconds.
> 
> i tested it with 4BSD and ULE with and without Preemption.
yep same thing here, it seems the process ( the "ps" one) doesn't get cputime
or something strange.

-db
> 
> 
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