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    SubjectRe: [rfc][patch] select_idle_sibling() inducing bouncing on westmere
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    On Sat, 2012-05-26 at 09:29 +0200, Peter Zijlstra wrote: 
    > On Sat, 2012-05-26 at 08:37 +0200, Mike Galbraith wrote:
    >
    > > 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
    >
    >
    > Oh yikes, I guess I wrecked
    > arch/x86/kernel/smpboot.c:cpu_coregroup_mask() in
    > 8e7fbcbc22c12414bcc9dfdd683637f58fb32759.
    >
    > That should very much always return llc mask, I just got that AMD case
    > confused. It looks like it should look like:
    >
    >
    > const struct cpumask *cpu_coregroup_mask(int cpu)
    > {
    > return cpu_llc_mask(cpu);
    > }

    All better.

    Too bad 'enterprise dude' turned cpuhog at 3.0, 'silly tester guy' would
    have spotted this instantly. Hohum, back to finding out what happened
    to cpufreq.

    [ 0.212062] CPU0 attaching sched-domain:
    [ 0.216016] domain 0: span 0-1 level MC
    [ 0.220013] groups: 0 1
    [ 0.222664] domain 1: span 0-3 level CPU
    [ 0.225754] groups: 0-1 (cpu_power = 2048) 2-3 (cpu_power = 2048)
    [ 0.233859] CPU1 attaching sched-domain:
    [ 0.236015] domain 0: span 0-1 level MC
    [ 0.241673] groups: 1 0
    [ 0.244385] domain 1: span 0-3 level CPU
    [ 0.248016] groups: 0-1 (cpu_power = 2048) 2-3 (cpu_power = 2048)
    [ 0.254219] CPU2 attaching sched-domain:
    [ 0.256016] domain 0: span 2-3 level MC
    [ 0.261673] groups: 2 3
    [ 0.264578] domain 1: span 0-3 level CPU
    [ 0.268016] groups: 2-3 (cpu_power = 2048) 0-1 (cpu_power = 2048)
    [ 0.276020] CPU3 attaching sched-domain:
    [ 0.279929] domain 0: span 2-3 level MC
    [ 0.281675] groups: 3 2
    [ 0.284577] domain 1: span 0-3 level CPU
    [ 0.289764] groups: 2-3 (cpu_power = 2048) 0-1 (cpu_power = 2048)





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