linux-kernel - Re: Integration of SCST in the mainstream Linux kernel

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Message-ID: <alpine.LFD.1.00.0802051016240.9374@woody.linux-foundation.org>
Date:	Tue, 5 Feb 2008 10:18:11 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Bart Van Assche <bart.vanassche@...il.com>
cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Vladislav Bolkhovitin <vst@...b.net>,
	Vu Pham <vuhuong@...lanox.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-scsi@...r.kernel.org, scst-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Subject: Re: Integration of SCST in the mainstream Linux kernel



On Tue, 5 Feb 2008, Bart Van Assche wrote:
> 
> Results that I did not expect:
> * A block transfer size of 1 MB is not enough to measure the maximal
> throughput. The maximal throughput is only reached at much higher
> block sizes (about 10 MB for SCST + SRP and about 100 MB for STGT +
> iSER).

Block transfer sizes over about 64kB are totally irrelevant for 99% of all 
people.

Don't even bother testing anything more. Yes, bigger transfers happen, but 
a lot of common loads have *smaller* transfers than 64kB.

So benchmarks that try to find "theoretical throughput" by just making big 
transfers should just be banned. They give numbers, yes, but the numbers 
are pointless.

			Linus
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