Messages in this thread | | | Date | Fri, 10 Nov 2006 12:10:18 +1100 | From | David Chinner <> | Subject | Re: XFS filesystem performance drop in kernels 2.6.16+ |
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On Thu, Nov 09, 2006 at 12:08:35PM -0600, Russell Cattelan wrote: > On Thu, 2006-11-09 at 20:30 +0300, 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). 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. > I would try verifying the problem on a non ide disk just > to confirm the write barrier theory. > > Also file a bug. > http://oss/sgi.com/bugzilla > include test case and hard description if possible.
and cc xfs@oss.sgi.com on XFS bug reports ;)
Cheers,
Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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