Re: [patch] CFS scheduler, -v8

[Ingo Molnar]

* Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> wrote:

> With -v7 I would run the n/n+1 test. Basically on a system with n 
> cpus, I would run n+1 tasks and see how their load is distributed. I 
> usually find that the last two tasks would get stuck on one CPU on the 
> system and would get half the cpu time as their other peers. I think 
> this issue has been around for long even before CFS. But while I was 
> investigating that, I found that with -v8, all the n+1 tasks are stuck 
> on the same cpu.

i believe this problem is specific to powerpc - load is distributed fine 
on i686/x86_64 and your sched_debug shows a cpu_load[0] == 0 on CPU#2 
which is 'impossible'. (I sent a few suggestions off-Cc about how to 
debug this.)

	Ingo
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