Re: Scheduler fairness problem on 2.6 series (Attn: Nick Piggin and others)

[Con Kolivas]

spaminos-ker@xxxxxxxxx writes:

> --- Con Kolivas <kernel@xxxxxxxxxxx> wrote:
> > Hi
> >
> > I tried this on the latest staircase patch (7.I) and am not getting any 
> > output from your script when tested up to 60 threads on my hardware. Can you 
> > try this version of staircase please?
> >
> > There are 7.I patches against 2.6.8-rc4 and 2.6.8-rc4-mm1
> >
> > http://ck.kolivas.org/patches/2.6/2.6.8/
> >
> > Cheers,
> > Con
>
> One thing to note is that I do get a lot of output from the script if I set
> interactive to 0 (delays between 3 and 13 seconds with 60 threads).

Sounds fair. 

With interactive==0 it will penalise tasks during their bursts of cpu usage 
in the interest of fairness, and your script effectively is BASH doing a 
burst of cpu so 3-13 second delays when the load is effectively >60 is 
pretty good.

Cheers,
Con

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