Re: [PATCH] Nick's scheduler policy v10

[Nick Piggin]

Martin J. Bligh wrote:

> > > > Kernbench: (make -j vmlinux, maximal tasks)
> > > >                             Elapsed      System        User         CPU
> > > >             2.6.0-test4       45.87      116.92      571.10     1499.00
> > > >      2.6.0-test4-nick10       46.91      114.03      584.16     1489.25
> > > Actually, now looks like you have significantly more idle time, so perhaps
> > > the cross-cpu (or cross-node) balancing isn't agressive enough:
> > Yeah, there is a patch for this in mm that is not in mine. It should
> > help both mine and mainline though...
>
> 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.


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