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Message-ID: <455368F4.8080203@sandeen.net> Date: Thu, 09 Nov 2006 11:44:20 -0600 From: Eric Sandeen <sandeen@...deen.net> To: "Igor A. Valcov" <viaprog@...il.com> CC: linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: XFS filesystem performance drop in kernels 2.6.16+ Igor A. Valcov wrote: > Hello, > > For one of our projects we have a test program that measures file > system performance by writing up to 1000 files simultaneously. After > installing kernel v2.6.16 we noticed that XFS performance dropped by a > factor of 5 (tests that took around 4 minutes on kernel 2.6.15 now > take around 20 minutes to complete). Ouch. > We then checked all kernels > starting from 2.6.16 up to 2.6.19-rc5 with the same unpleasant result. > The funny thing about all this is that we chose XFS for that > particular project specifically because it was about 5 times faster > with the tests than the other file systems. Now they all take about > the same time. > > I also noticed that I/O barriers were introduced in v2.6.16 and > thought they may be the cause, but mounting the file system with > 'nobarrier' doesn't seem to affect the performance in any way. > > Any thoughts on the matter are appreciated. Can you provide the test? -Eric - 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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