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

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Message-ID: <47A30790.8080402@vlnb.net>
Date:	Fri, 01 Feb 2008 14:50:40 +0300
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	Bart Van Assche <bart.vanassche@...il.com>
CC:	landman@...lableinformatics.com, fujita.tomonori@....ntt.co.jp,
	linux-scsi@...r.kernel.org, rdreier@...co.com,
	linux-kernel@...r.kernel.org,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	James.Bottomley@...senpartnership.com,
	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

Bart Van Assche wrote:
> On Jan 31, 2008 5:25 PM, Joe Landman <landman@...lableinformatics.com> wrote:
> 
>>Vladislav Bolkhovitin wrote:
>>
>>>Actually, I don't know what kind of conclusions it is possible to make
>>>from disktest's results (maybe only how throughput gets bigger or slower
>>>with increasing number of threads?), it's a good stress test tool, but
>>>not more.
>>
>>Unfortunately, I agree.  Bonnie++, dd tests, and a few others seem to
>>bear far closer to "real world" tests than disktest and iozone, the
>>latter of which does more to test the speed of RAM cache and system call
>>performance than actual IO.
> 
> 
> I have ran some tests with Bonnie++, but found out that on a fast
> network like IB the filesystem used for the test has a really big
> impact on the test results.
> 
> If anyone has a suggestion for a better test than dd to compare the
> performance of SCSI storage protocols, please let it know.

I would suggest you to try something from real life, like:

  - Copying large file tree over a single or multiple IB links

  - Measure of some DB engine's TPC

  - etc.

> Bart Van Assche.
> 
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