linux-kernel - Re: 3ware disk latency?

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Message-ID: <20060727134215.GT1703@fi.muni.cz>
Date:	Thu, 27 Jul 2006 15:42:15 +0200
From:	Jan Kasprzak <kas@...muni.cz>
To:	dean gaudet <dean@...tic.org>
Cc:	adam radford <aradford@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: 3ware disk latency?

dean gaudet wrote:
: On Wed, 26 Jul 2006, adam radford wrote:
: > 
: > 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.

	2.6.17.7 also does not allow cmd_per_lun to be written.

-Yenya

-- 
| Jan "Yenya" Kasprzak  <kas at {fi.muni.cz - work | yenya.net - private}> |
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| http://www.fi.muni.cz/~kas/    Journal: http://www.fi.muni.cz/~kas/blog/ |
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