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    SubjectRe: [RFC PATCH 0/4] Gang scheduling in CFS
    Date
    On Sat, 31 Dec 2011 07:51:15 +0530, Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> wrote:
    > On Fri, 30 Dec 2011 15:40:06 +0530, Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> wrote:
    > > On Fri, 30 Dec 2011 10:51:47 +0100, Ingo Molnar <mingo@elte.hu> wrote:
    > > >
    > > > * Avi Kivity <avi@redhat.com> wrote:
    > > >
    > > > > [...]
    > > > >
    > > > > The first part appears to be unrelated to ebizzy itself - it's
    > > > > the kunmap_atomic() flushing ptes. It could be eliminated by
    > > > > switching to a non-highmem kernel, or by allocating more PTEs
    > > > > for kmap_atomic() and batching the flush.
    > > >
    > > > Nikunj, please only run pure 64-bit/64-bit combinations - by the
    > > > time any fix goes upstream and trickles down to distros 32-bit
    > > > guests will be even less relevant than they are today.
    > > >
    > > Sure Ingo, got a 64bit guest working yesterday and I am in process of
    > > getting the benchmark numbers for the same.
    > >
    > Here is the results collected from the 64bit VM runs.
    >
    [...]

    PLE worst case:

    >
    > dbench 8vm (degraded -8%)
    > | dbench| 2.27 | 2.09 | -8 |
    [...]
    > dbench needs some more love, i will get the perf top caller for
    > that.
    >

    Baseline:
    75.18% init [kernel.kallsyms] [k] native_safe_halt
    23.32% swapper [kernel.kallsyms] [k] native_safe_halt

    Gang V2:
    73.21% init [kernel.kallsyms] [k] native_safe_halt
    25.74% swapper [kernel.kallsyms] [k] native_safe_halt

    That does not give much clue :(
    Comments?

    > non-PLE - Test Setup:
    >
    > dbench 8vm (degraded -30%)
    > | dbench| 2.01 | 1.38 | -30 |


    Baseline:
    57.75% init [kernel.kallsyms] [k] native_safe_halt
    40.88% swapper [kernel.kallsyms] [k] native_safe_halt

    Gang V2:
    56.25% init [kernel.kallsyms] [k] native_safe_halt
    42.84% swapper [kernel.kallsyms] [k] native_safe_halt

    Similar comparison here.

    Regards
    Nikunj



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