Messages in this thread | | | Date | Wed, 13 Feb 2008 17:37:08 +0530 | From | Srivatsa Vaddagiri <> | Subject | Re: 2.6.25-rc1: volanoMark 45% regression |
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On Wed, Feb 13, 2008 at 03:15:16PM +0530, Balbir Singh wrote: > Zhang, Yanmin wrote: > > volanoMark has 45% regression with kernel 2.6.25-rc1 on my both 8-core > > stoakley and 16-core Tigerton. > > > > I used bisect to locate below patch. > > > > commit 58e2d4ca581167c2a079f4ee02be2f0bc52e8729 > > Author: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> > > Date: Fri Jan 25 21:08:00 2008 +0100 > > > > sched: group scheduling, change how cpu load is calculated > > > > > > > > hackbench has about 30% regression on 16-core tigerton, but has about 10% improvement > > on 8-core stoakley. > > > > In addition, tbench has about 6% regression on my 8-core stoakley and > > 25% regression on 16-core stoakley. Some other benchmarks, like netperf/aim7 > > also have some regression. I will verify if they are all related to the > > patch. > > > > -yanmin > > Hi, Yamin, > > Thanks for reporting the issue? Any chance we could getthe Oprofile output for > the run? The exact commandline and .config being used would also help.
Yamin, I would also like to know against which previous version is this regression being compared with. Is it 2.6.24? Did you have CONFIG_FAIR_USER_SCHED enabled in both cases? It would also help to know if you see the same regression with FAIR_GROUP_SCHED turned off.
-- Regards, vatsa
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