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    SubjectRe: [rfc][patch] select_idle_sibling() inducing bouncing on westmere
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    On Fri, 2012-05-25 at 08:14 +0200, Mike Galbraith wrote: 
    > On Thu, 2012-05-24 at 15:20 +0200, Peter Zijlstra wrote:
    > > On Thu, 2012-05-24 at 15:17 +0200, Peter Zijlstra wrote:
    > > > For power7 with 4 smt it would end up as 1230 I guess.
    > >
    > > One more thing, in light of that, can't you simplify the core stuff to
    > > be a simple shift as well? map them 123450, does it really matter to
    > > pair them off like 103254 ?
    >
    > In my head it does. Buddies need to be glued together so we can use
    > them as a team to convert overlap and kick butt on ramp up.

    Ew. 3.4 went broke for Q6600, and performance went... far far away.

    [ 0.200057] CPU0 attaching sched-domain:
    [ 0.204016] domain 0: span 0-3 level MC
    [ 0.208015] groups: 0 1 2 3
    [ 0.210970] CPU1 attaching sched-domain:
    [ 0.212014] domain 0: span 0-3 level MC
    [ 0.216016] groups: 1 2 3 0
    [ 0.220016] CPU2 attaching sched-domain:
    [ 0.224015] domain 0: span 0-3 level MC
    [ 0.228016] groups: 2 3 0 1
    [ 0.232015] CPU3 attaching sched-domain:
    [ 0.236016] domain 0: span 0-3 level MC
    [ 0.240017] groups: 3 0 1 2

    11.791806 usecs/loop -- avg 11.534552 173.4 KHz

    Cause: sometimes during boot, hw Siamese twins are 0-1 2-3, and
    sometimes, as in this boot, 0-3 1-2, so busted groups above does the
    worst thing possible. When twins are 0-1 2-3, busted groups doesn't
    matter with $subject patch applied, it glues Siamese twins back
    together. During this boot, it created Siamese aliens from hell.

    -Mike



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