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SubjectRe: [PATCH 0/18] Basic scheduler support for automatic NUMA balancing V5
On Mon, Jul 15, 2013 at 04:20:02PM +0100, Mel Gorman wrote:
>
> specjbb
> 3.9.0 3.9.0 3.9.0 3.9.0
> vanilla accountload-v5 retrymigrate-v5 swaptasks-v5
> TPut 1 24474.00 ( 0.00%) 24303.00 ( -0.70%) 23529.00 ( -3.86%) 26110.00 ( 6.68%)
> TPut 7 186914.00 ( 0.00%) 179962.00 ( -3.72%) 183667.00 ( -1.74%) 185912.00 ( -0.54%)
> TPut 13 334429.00 ( 0.00%) 327558.00 ( -2.05%) 336418.00 ( 0.59%) 334563.00 ( 0.04%)
> TPut 19 422820.00 ( 0.00%) 451359.00 ( 6.75%) 450069.00 ( 6.44%) 426753.00 ( 0.93%)
> TPut 25 456121.00 ( 0.00%) 533432.00 ( 16.95%) 504138.00 ( 10.53%) 503152.00 ( 10.31%)
> TPut 31 438595.00 ( 0.00%) 510638.00 ( 16.43%) 442937.00 ( 0.99%) 486450.00 ( 10.91%)
> TPut 37 409654.00 ( 0.00%) 475468.00 ( 16.07%) 427673.00 ( 4.40%) 460531.00 ( 12.42%)
> TPut 43 370941.00 ( 0.00%) 442169.00 ( 19.20%) 387382.00 ( 4.43%) 425120.00 ( 14.61%)
>
> It's interesting that retrying the migrate introduced such a large dent. I
> do not know why at this point. Swapping the tasks helped and overall the
> performance is all right with room for improvement.

I think it means that our direct migration scheme is creating too much
imbalance and doing it more often results in more task movement to fix
it up again, hindering page migration efforts to settle on a node.


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