Re: Delete scheduler SD_WAKE_AFFINE and SD_WAKE_BALANCE flags

From: Ingo Molnar
Date: Fri Jul 29 2005 - 06:33:30 EST

* Chen, Kenneth W <kenneth.w.chen@xxxxxxxxx> wrote:

> To demonstrate the problem, we turned off these two flags in the cpu
> sd domain and measured a stunning 2.15% performance gain! And
> deleting all the code in the try_to_wake_up() pertain to load
> balancing gives us another 0.2% gain.

another thing: do you have a HT-capable ia64 CPU, and do you have
CONFIG_SCHED_SMT turned on? If yes then could you try to turn off
SD_WAKE_IDLE too, i found it to bring further performance improvements
in certain workloads.

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