Subject : dbench 15% regression with 2.6.28-rc1 Submitter : "Zhang, Yanmin" <yanmin_zhang@linux.intel.com> Date : 2008-10-28 8:41 References : http://marc.info/?l=linux-kernel&m=122518333103345&w=4 This entry is being used for tracking a regression from 2.6.27. Please don't close it until the problem is fixed in the mainline.
Caused by: commit 695698500912c4479ddf4723e492de3970ff8530 Author: Peter Zijlstra <a.p.zijlstra@chello.nl> Date: Tue Sep 23 14:54:23 2008 +0200 sched: rework wakeup preemption Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
On Fri, 2008-10-31 at 15:01 -0700, bugme-daemon@bugzilla.kernel.org wrote: > ------- Comment #1 from rjw@sisk.pl 2008-10-31 15:01 ------- > Caused by: > > commit 695698500912c4479ddf4723e492de3970ff8530 > Author: Peter Zijlstra <a.p.zijlstra@chello.nl> > Date: Tue Sep 23 14:54:23 2008 +0200 > > sched: rework wakeup preemption > > Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> > Signed-off-by: Ingo Molnar <mingo@elte.hu> Basically reverted by: commit 464b75273f64be7c81fee975bd6ca9593df3427b Author: Peter Zijlstra <a.p.zijlstra@chello.nl> Date: Fri Oct 24 11:06:15 2008 +0200 sched: re-instate vruntime based wakeup preemption The advantage is that vruntime based wakeup preemption has a better conceptual model. Here wakeup_gran = 0 means: preempt when 'fair'. Therefore wakeup_gran is the granularity of unfairness we allow in order to make progress. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Which is already in -git
I confirm 2.6.28-rc3 fixes it.