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

Ingo Molnar
2004-03-30T07:45:06Z

* Nick Piggin <nickpiggin@yahoo.com.au> wrote:

> >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.

i dont think we want to balance with that high of a frequency on NUMA
Opteron. These tunes were for testing only.

i'm dusting off the balance-on-clone patch right now, that should be the
correct solution. It is based on a find_idlest_cpu() function which
searches for the least loaded CPU and checks whether we can do passive
load-balancing to it. Ie. it's yet another balancing point in the
scheduler, _not_ some balancing logic change.

Ingo