Re: Delete scheduler SD_WAKE_AFFINE and SD_WAKE_BALANCE flags

From: Ingo Molnar <>
Date: 2005-07-29 21:26:16
* Chen, Kenneth W <> 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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Received on Fri Jul 29 07:29:29 2005

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:40 EST