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From: Andre Noll <maan@systemlinux.org>
To: Chris Snook <csnook@redhat.com>
Cc: "adam radford" <aradford@gmail.com>,
	"Tony Battersby" <tonyb@cybernetics.com>,
	"Johannes Wörner" <johannes.woerner@tuebingen.mpg.de>,
	"James Bottomley" <James.Bottomley@HansenPartnership.com>,
	linux-scsi <linux-scsi@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3
Date: Thu, 28 Feb 2008 10:46:20 +0100	[thread overview]
Message-ID: <20080228094620.GD29468@skl-net.de> (raw)
In-Reply-To: <47C5C048.9080704@redhat.com>

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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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  reply	other threads:[~2008-02-28  9:48 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-26 17:43 Andre Noll
2008-02-26 17:54 ` Bernd Schubert
2008-02-27 10:10   ` Andre Noll
2008-02-26 18:33 ` Chris Snook
2008-02-27 10:11   ` Andre Noll
2008-02-27 19:55     ` Chris Snook
2008-02-28  9:46       ` Andre Noll [this message]
2008-02-26 23:07 ` Arnd Hannemann
2008-02-27 10:11   ` Andre Noll
2008-02-27 14:26     ` Tony Battersby
2008-02-27 17:05       ` Andre Noll
2008-02-27 20:06         ` adam radford
2008-02-28  9:46           ` Andre Noll

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