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    SubjectRe: [RFC PATCH 0/4] Gang scheduling in CFS
    Date
    On Mon, 19 Dec 2011 12:23:26 +0100, Ingo Molnar <mingo@elte.hu> wrote:
    >
    > * Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com> wrote:
    >
    > So could we please approach this from the benchmarked workload
    > angle first? The highest improvement is in ebizzy:
    >
    > > ebizzy 2vm (improved 15 times, i.e. 1520%)
    >
    > What's behind this huge speedup? Does ebizzy use user-space
    > spinlocks perhaps? Could we do something on the user-space side
    > to get a similar speedup?
    >
    This is from the perf run on the host:

    Baseline:

    16.22% qemu-kvm [kvm_intel] [k] free_kvm_area
    8.27% qemu-kvm [kvm] [k] start_apic_timer
    7.53% qemu-kvm [kvm] [k] kvm_put_guest_fpu

    Gang:

    24.44% qemu-kvm [kvm_intel] [k] free_kvm_area
    13.42% qemu-kvm [kvm] [k] start_apic_timer
    9.91% qemu-kvm [kvm] [k] kvm_put_guest_fpu

    Ingo, Avi, I am not getting anything obvious from this. Any ideas?

    Regards
    Nikunj



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