linux-kernel - Re: [Scst-devel] Integration of SCST in the mainstream Linux kernel

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Date:	Thu, 31 Jan 2008 13:12:15 -0500
From:	David Dillow <dillowda@...l.gov>
To:	Bart Van Assche <bart.vanassche@...il.com>
Cc:	landman@...lableinformatics.com,
	Vladislav Bolkhovitin <vst@...b.net>,
	James.Bottomley@...senpartnership.com, linux-scsi@...r.kernel.org,
	rdreier@...co.com, linux-kernel@...r.kernel.org,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	fujita.tomonori@....ntt.co.jp, scst-devel@...ts.sourceforge.net,
	akpm@...ux-foundation.org, FUJITA Tomonori <tomof@....org>,
	torvalds@...ux-foundation.org
Subject: Re: [Scst-devel] Integration of SCST in the mainstream Linux kernel


On Thu, 2008-01-31 at 18:08 +0100, Bart Van Assche wrote:
> If anyone has a suggestion for a better test than dd to compare the
> performance of SCSI storage protocols, please let it know.

xdd on /dev/sda, sdb, etc. using -dio to do direct IO seems to work
decently, though it is hard (ie, impossible) to get a repeatable
sequence of IO when using higher queue depths, as it uses threads to
generate multiple requests.

You may also look at sgpdd_survey from Lustre's iokit, but I've not done
much with that -- it uses the sg devices to send lowlevel SCSI commands.

I've been playing around with some benchmark code using libaio, but it's
not in generally usable shape.

xdd:
http://www.ioperformance.com/products.htm

Lustre IO Kit:
http://manual.lustre.org/manual/LustreManual16_HTML/DynamicHTML-20-1.html
-- 
Dave Dillow
National Center for Computational Science
Oak Ridge National Laboratory
(865) 241-6602 office


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