Re: [PATCH] Nick's scheduler policy v10

[Nick Piggin <piggin@cyberone.com.au>]

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.