Re: [PATCH 0/18] sched: simplified fork, enable load average intoLB and power awareness scheduling

[Arjan van de Ven]

On 12/11/2012 7:48 AM, Borislav Petkov wrote:
> On Tue, Dec 11, 2012 at 08:10:20PM +0800, Alex Shi wrote:
> > Another testing of parallel compress with pigz on Linus' git tree.
> > results show we get much better performance/power with powersaving and
> > balance policy:
> >
> > testing command:
> > #pigz -k -c  -p$x -r linux* &> /dev/null
> >
> > On a NHM EP box
> >           powersaving               balance   	         performance
> > x = 4    166.516 /88 68           170.515 /82 71         165.283 /103 58
> > x = 8    173.654 /61 94           177.693 /60 93         172.31 /76 76
>
> This looks funny: so "performance" is eating less watts than
> "powersaving" and "balance" on NHM. Could it be that the average watts
> measurements on NHM are not correct/precise..? On SNB they look as
> expected, according to your scheme.

well... it's not always beneficial to group or to spread out
it depends on cache behavior mostly which is best

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