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    SubjectRe: load balancing regression since commit 367456c7
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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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