RE: Delete scheduler SD_WAKE_AFFINE and SD_WAKE_BALANCE flags

From: Chen, Kenneth W <kenneth.w.chen_at_intel.com>
Date: 2005-07-30 03:30:12
Ingo Molnar wrote on Friday, July 29, 2005 4:26 AM
> * Chen, Kenneth W <kenneth.w.chen@intel.com> 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.

The scheduler experiments done so far are on non-SMT CPU (Madison processor).
We have another db setup with multi-thread capable ia64 cpu (montecito, and to
be precise, it is SOEMT capable).  We are just about to do scheduler experiments
on that setup.


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Received on Fri Jul 29 13:31:44 2005

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