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    SubjectRe: [patch v3 0/8] sched: use runnable avg in load balance
    On 04/02/2013 04:35 PM, Alex Shi wrote:
    [snip]
    >>
    >> The reason may caused by wake_affine()'s higher overhead, and pgbench is
    >> really sensitive to this stuff...
    >
    > Thanks for testing. Could you like to remove the last patch and test it
    > again? I want to know if the last patch has effect on pgbench.

    Done, here the results of pgbench without the last patch on my box:

    | db_size | clients | tps | | tps |
    +---------+---------+-------+ +-------+
    | 22 MB | 1 | 10662 | | 10679 |
    | 22 MB | 2 | 21483 | | 21471 |
    | 22 MB | 4 | 42046 | | 41957 |
    | 22 MB | 8 | 55807 | | 55684 |
    | 22 MB | 12 | 50768 | | 52074 |
    | 22 MB | 16 | 49880 | | 52879 |
    | 22 MB | 24 | 45904 | | 53406 |
    | 22 MB | 32 | 43420 | | 54088 | +24.57%
    | 7484 MB | 1 | 7965 | | 7725 |
    | 7484 MB | 2 | 19354 | | 19405 |
    | 7484 MB | 4 | 37552 | | 37246 |
    | 7484 MB | 8 | 48655 | | 50613 |
    | 7484 MB | 12 | 45778 | | 47639 |
    | 7484 MB | 16 | 45659 | | 48707 |
    | 7484 MB | 24 | 42192 | | 46469 |
    | 7484 MB | 32 | 36385 | | 46346 | +27.38%
    | 15 GB | 1 | 7677 | | 7727 |
    | 15 GB | 2 | 19227 | | 19199 |
    | 15 GB | 4 | 37335 | | 37372 |
    | 15 GB | 8 | 48130 | | 50333 |
    | 15 GB | 12 | 45393 | | 47590 |
    | 15 GB | 16 | 45110 | | 48091 |
    | 15 GB | 24 | 41415 | | 47415 |
    | 15 GB | 32 | 35988 | | 45749 | +27.12%

    Very nice improvement, I'd like to test it with the wake-affine throttle
    patch later, let's see what will happen ;-)

    Any idea on why the last one caused the regression?

    Regards,
    Michael Wang

    >



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