Date: Mon, 10 Dec 2001 00:13:23 +0100
From: Kurt Garloff <garloff@suse.de>
To: Greg Hennessy <gsh@cox.rr.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: horrible disk thorughput on itanium
Message-ID: <20011210001323.D25025@nbkurt.etpnet.phys.tue.nl>
Mail-Followup-To: Kurt Garloff <garloff@suse.de>,
	Greg Hennessy <gsh@cox.rr.com>, linux-kernel@vger.kernel.org
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Hi,

On Thu, Dec 06, 2001 at 11:07:14AM -0500, Greg Hennessy wrote:
> [root@hydra bonnie]# cat bonnie.hydra bonnie.leo=20
[...]
> 	      --Seeks---
> Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU
> /sec %CPU
>           100  1765 100.0 282891 100.1 377295 100.0  2058 100.0 592709
> 	  99.5 51920.4 196.5

I bet you have more than 100MB RAM, so you measure memory performance
instead of disk performance in the block reads and writes. Same for seeks.
Don't do that. Always use at least twice you ram size if you're interested
in seeing your disk speed.
Newer bonnies warn you about it. The current release is 1.2.
http://www.garloff.de/kurt/linux/bonnie/

The char reads/writes seem to suffer glibc overhead.
You can use the _unlocked variants with option -u and see whether this makes
a difference.

Regards,
--=20
Kurt Garloff  <garloff@suse.de>                          Eindhoven, NL
GPG key: See mail header, key servers         Linux kernel development
SuSE GmbH, Nuernberg, DE                                SCSI, Security

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