From owner-freebsd-current@FreeBSD.ORG  Wed Mar 30 17:09:41 2005
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Date: Wed, 30 Mar 2005 09:09:40 -0800 (PST)
From: Doug White <dwhite@gumbysoft.com>
To: Andrey Koklin <aka@veco.ru>
In-Reply-To: <20050330191824.4c08acc6.aka@veco.ru>
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cc: Poul-Henning Kamp <phk@phk.freebsd.dk>
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cc: Maxim Sobolev <sobomax@portaone.com>
Subject: Re: ciss(4): speed degradation for Compaq Smart Array [edited]
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On Wed, 30 Mar 2005, Andrey Koklin wrote:

> Firstly, I'm thankful to people who had found time to answer my previous
> messed post privately. Indeed, I hadn't put there key information about
> my system configuration, as well as the tests themselves say little or
> nothing on real disk system performance (they used 1K blocks and didn't
> take into consideration disks geometry).

You've still omitted the array setup, including RAID type and stripe size.

I'd also suggest using a tool like iozone to run your tests instead of dd.
Unless your workload consists of entirely sequential writes this perf test
is worthless.

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite@gumbysoft.com          |  www.FreeBSD.org