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    SubjectRe: [mm] f7b5d647946: -3.0% dbench.throughput-MB/sec
    On Tue, Aug 19, 2014 at 12:41:34PM +0800, Fengguang Wu wrote:
    > Hi Mel,
    >
    > We noticed a minor dbench throughput regression on commit
    > f7b5d647946aae1647bf5cd26c16b3a793c1ac49 ("mm: page_alloc: abort fair
    > zone allocation policy when remotes nodes are encountered").
    >
    > testcase: ivb44/dbench/100%
    >
    > bb0b6dffa2ccfbd f7b5d647946aae1647bf5cd26
    > --------------- -------------------------
    > 25692 ± 0% -3.0% 24913 ± 0% dbench.throughput-MB/sec
    > 6974259 ± 6% -12.1% 6127616 ± 0% meminfo.DirectMap2M
    > 18.43 ± 0% -4.6% 17.59 ± 0% turbostat.RAM_W
    > 9302 ± 0% -3.6% 8965 ± 1% time.user_time
    > 1425791 ± 1% -2.0% 1396598 ± 0% time.involuntary_context_switches
    >
    > Disclaimer:
    > Results have been estimated based on internal Intel analysis and are provided
    > for informational purposes only. Any difference in system hardware or software
    > design or configuration may affect actual performance.
    >

    DirectMap2M changing is a major surprise and doesn't make sense for this
    machine. Did the amount of memory in the machine change between two
    tests?

    --
    Mel Gorman
    SUSE Labs
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