linux-kernel - Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3

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Message-ID: <20080228094620.GD29468@skl-net.de>
Date:	Thu, 28 Feb 2008 10:46:20 +0100
From:	Andre Noll <maan@...temlinux.org>
To:	Chris Snook <csnook@...hat.com>
Cc:	adam radford <aradford@...il.com>,
	Tony Battersby <tonyb@...ernetics.com>,
	Johannes Wörner 
	<johannes.woerner@...bingen.mpg.de>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3

On 14:55, Chris Snook wrote:

> Does the machine become unresponsive during the single-threaded test, or 
> only when doing the rsync?

It takes noticably longer to ssh into the machine also in the
single-threaded case (using dd to write to the device), but the
system remains usable. When the rsync job is running, it becomes
unusable quickly.

However, reducing the queue depth with

	echo 16 > /sys/block/sda/device/queue_depth

as suggested by Adam, solves all problems.

Thanks all for your help.
Andre
-- 
The only person who always got his work done by Friday was Robinson Crusoe

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