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Date: Thu, 14 Apr 2011 17:09:26 +0200 From: Andrea Arcangeli <aarcange@...hat.com> To: raz ben yehuda <raziebe@...il.com> Cc: lkml <linux-kernel@...r.kernel.org>, riel@...hat.com, kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org, Mel Gorman <mel@....ul.ie> Subject: Re: 2.6.38 sbrk regression On Thu, Apr 14, 2011 at 02:49:14PM +0300, raz ben yehuda wrote: > Hey Andrea > Me again. I managed to ftrace ( function graph ) the two kernels. I used > 2.6.37 and 2.6.39-rc3. The bellow is example for sys_brk calls traces > from each kernel. As you can see, there is no "single smoking gun" > here. > > The vm functions durations increased as a whole. > I repeated the tests from sha1 4e9f64c42d0ba5eb0c78569435ada4c224332ce4 > compared to sha1 152c9ccb75548c027fa3103efa4fa4e19a345449 and it is > consistent. ~13% performance decrease. > > Can you see any relation to thp that might causes this degradation ? With compaction and THP off I don't see how it could change anything. But can you try the THP-33 tag of my aa.git tree, that was based on 2.3.37-rc5 so it'll rule out the whole THP patchset if it doesn't regress compared to 2.6.37-rc5 vanilla. git clone --reference linux-2.6 git://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git git checkout THP-33 Thanks, Andrea -- 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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