Re: [Lse-tech] [patch] sched-domain cleanups, sched-2.6.5-rc2-mm2-A3

Nick Piggin
2004-03-30T07:14:47Z

Andi Kleen wrote:
> On Tue, 30 Mar 2004 08:40:15 +0200
> Ingo Molnar <mingo@elte.hu> wrote:
>
>
>>* Andi Kleen <ak@suse.de> wrote:
>>
>>
>>>>So both -mm5 and Ingo's sched.patch are much worse than
>>>>what 2.4 and 2.6 get?
>>>
>>>Yes (2.6 vanilla and 2.4-aa at that, i haven't tested 2.4-vanilla)
>>>
>>>Ingo's sched.patch makes it a bit better (from 1x CPU to 1.5-1.7xCPU),
>>>but still much worse than the max of 3.7x-4x CPU bandwidth.
>>
>>Andi, could you please try the patch below - this will test whether this
>>has to do with the rate of balancing between NUMA nodes. The patch
>>itself is not correct (it way overbalances on NUMA), but it tests the
>>theory.
>
>
> This works much better, but wildly varying (my tests go from 2.8xCPU to
> ~3.8x CPU for 4 CPUs. 2,3 CPU cases are ok). A bit more consistent
> results would be better though.
>

Oh good, thanks Ingo. Andi you probably want to lower your minimum
balance time too then, and maybe try with an even lower maximum.
Maybe reduce cache_hot_time a bit too.