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Date: Tue, 13 Nov 2007 09:49:04 +0800 From: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> To: Mark Lord <lkml@....ca> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, LKML <linux-kernel@...r.kernel.org> Subject: Re: iozone write 50% regression in kernel 2.6.24-rc1 On Mon, 2007-11-12 at 12:25 -0500, Mark Lord wrote: > 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. I just use command '#iozone -i 0 -r 4k -s 512m', no '-e -c'. So if we consider cache, the speed is very fast. On my machine with 2.6.23, the write speed is 631M/s, quite fast. :) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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