linux-kernel - Re: 3ware disk latency?

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Date:	Wed, 26 Jul 2006 20:00:58 -0700 (PDT)
From:	dean gaudet <dean@...tic.org>
To:	adam radford <aradford@...il.com>
cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Jan Kasprzak <kas@...muni.cz>,
	linux-kernel@...r.kernel.org
Subject: Re: 3ware disk latency?

On Wed, 26 Jul 2006, adam radford wrote:

> On 7/26/06, dean gaudet <dean@...tic.org> wrote:
> > 
> > unfortunately when i did the experiment i neglected to perform
> > simultaneous tests on more than one 3ware unit on the same controller.  i
> > got great results from a raid1 or from a raid10 (even a raid5)... but
> > never i only tested one unit at a time.
> > 
> 
> Did you try setting /sys/class/scsi_host/hostX/cmd_per_lun to 256 / num_units
> ?

hmm doesn't look like i can do this in 2.6.16.27:

# ls -l /sys/class/scsi_host/host0/cmd_per_lun
-r--r--r-- 1 root root 0 Jul 26 19:58 /sys/class/scsi_host/host0/cmd_per_lun
# echo 85 >!$
echo 85 >/sys/class/scsi_host/host0/cmd_per_lun
zsh: permission denied: /sys/class/scsi_host/host0/cmd_per_lun

it'll probably be sometime until i update this box past 2.6.16.x ... but 
i'll keep it in mind and retry the experiment... thanks.

-dean
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