Messages in this thread | | | Subject | Re: hackbench regression with 2.6.26-rc2 on tulsa machine | From | Mike Galbraith <> | Date | Wed, 21 May 2008 07:19:48 +0200 |
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On Wed, 2008-05-21 at 12:54 +0800, Zhang, Yanmin wrote: > On Tue, 2008-05-20 at 11:22 +0200, Mike Galbraith wrote:
> > Do you still have group scheduling enabled? > Yes. > CONFIG_GROUP_SCHED=y > CONFIG_FAIR_GROUP_SCHED=y > # CONFIG_RT_GROUP_SCHED is not set > CONFIG_USER_SCHED=y > # CONFIG_CGROUP_SCHED is not set > > > If so, can you turn it off > > and try again? (when in doubt, grasp at any straw within reach;) > I reran the test for dozeons of times. > 1) Background processes have impact on the result and cause result to fluctuate with 8~9 seconds; > 2) After turning off most services (background processes), the result looks stable; > 3) I tested both 2.6.26-rc1 and 2.6.26-rc2 with CONFIG_GROUP_SCHED=n. the first one's result > is about 30 seconds and the second one's result is about 31 seconds. So CONFIG_GROUP_SCHED is the key.
Thanks a bunch for re-testing.
-Mike
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