Messages in this thread | | | Subject | Re: load balancing regression since commit 367456c7 | From | Peter Zijlstra <> | Date | Fri, 20 Apr 2012 19:33:22 +0200 |
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On Fri, 2012-04-20 at 10:13 -0700, Tim Chen wrote: > On Fri, 2012-04-20 at 18:53 +0200, Peter Zijlstra wrote: > > On Fri, 2012-04-20 at 09:40 -0700, Tim Chen wrote: > > > We also do not see regression for hackbench on WSM-EP, but only > > > on machines with Sandy-Bridge EP (2 socket, 8 cores/socket, HT enabled). > > > > Argh, Suresh, any idea what could be different and relevant to this > > issue between WSM and SNB -EP ? > > > > Tim, can you see the problem on the desktop SNB part? That's the only > > SNB I have available. > > > > > We are not running hackbench in cgroup for this test. > > > > > > The Sandy Bridge EP machines installed has FC16, so I think it uses > > > systemd. The machine on our WSM EP has FC15, which also has systemd. > > > > Ah, but your .config has: > > > > CONFIG_CGROUP_SCHED=y > > CONFIG_SCHED_AUTOGROUP=y > > > > and systemd, when cpu-cgroup is available, will automagically use it. > > > > Could you disable those two CONFIG knobs and see if it persists? > > > > Turning those off did recover the regression.
OK, I'll go stare at the cgroup part then.. Thanks!
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