Re: [PATCH] Nick's scheduler policy v10

[Nick Piggin]

Martin J. Bligh wrote:

> > > Not convinced of that - mm performs worse than mainline for me.
> > Well, one of Con's patches caused a lot of idle time on volanomark.
> > The reason for the change was unclear. I guess either a fairness or
> > wakeup latency change (yes, it was a very scientific process, ahem).
> >
> > Anyway, in the process of looking at the load balancing, we found
> > and fixed a problem (although it might now possibly over balance).
> > This did cure most of the idle problems.
> >
> > So it could just be small changes causing things to go out of whack.
> > I will try to get better data after (if ever) the thing is working
> > nicely on the desktop.
>
> I think Con and I worked out that the degredations I was seeing 
> (on kernbench and SDET) were due to (in his words) "my hacks throwing the 
> cc cpu hogs onto the expired array more frequently".

This didn't explain the huge idle time increases on volanomark and
SPECjbb I think.



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