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. > > Thanks in advance, -- Russell Cattelan <[email protected]>
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