linux-kernel - Re: iozone write 50% regression in kernel 2.6.24-rc1

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Date:	Mon, 12 Nov 2007 12:25:00 -0500
From:	Mark Lord <lkml@....ca>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: iozone write 50% regression in kernel 2.6.24-rc1

Peter Zijlstra wrote:
..
> While I see that the write speed as reported under .24 ~70MB/s is much
> lower than the one reported under .23 ~200MB/s, I find it very hard to
> believe my poor single SATA disk could actually do the 200MB/s for
> longer than its cache 8/16 MB (not sure).
> 
> vmstat shows that actual IO is done, even though the whole 512MB could
> fit in cache, hence my suspicion that the ~70MB/s is the most realistic
> of the two.
..

Yeah, sequential 70MB/sec is quite realistic for a modern SATA drive.

But significantly faster than that (say, 100MB/sec +) is unlikely at present.
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