Date: Fri, 16 Jan 2004 12:19:50 -0800
From: Mike Fedyk <mfedyk@matchmail.com>
To: Marc-Christian Petersen <m.c.p@wolk-project.de>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [2.6.1 vanilla] Accessing CD-ROM drive causes 94% "hi" load
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	lkml <linux-kernel@vger.kernel.org>
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On Fri, Jan 16, 2004 at 02:48:16PM +0100, Marc-Christian Petersen wrote:
> Hello there,
> 
> accessing my CD-ROM drive causes my system to generate 94% "hi" in
> top. I reproduced it using the following steps:
> 
> 1. mount /dev/hda /cdrom
> 2. cat /cdrom/* > /dev/null
> 
> During this timeperiod, the system does almost stop to do any other
> I/O, i.e. accessing my SATA drives on an LVM2 stripeset and doing "cat
> largefile > /dev/null" does not read the usual 60 MB/s but only like 2
> or 3. I am using the anticipatory scheduler, but tried out the
> deadline elevator which doesn't change anything.

Try hdparm -d1 on your cdrom drive.
-
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