Re: [ckrm-tech] Re: [PATCH 0/9] CPU controller

[MAEDA Naoaki]

On Fri, 28 Apr 2006 09:56:52 +0400
Kirill Korotaev <dev@xxxxx> wrote:

> Also, as it turned out these doesn't do good fair scheduling under some 
> curcemstances (with busy loops on SMP) :(. Which was reported to MAEDA.

Although it has buggy behaviour under some circumstances, 
the foundamental problem of load unfairness on SMP comes from
the fact that a single task can not use more than one CPU at a time.
On condtion that there aren't enough number of runnable tasks on SMP,
achievable shares very depend on how tasks are allocated to CPU. 

So a few busy loops on SMP is a tough case. It is alleviated
by increasing the number of runnable tasks.

Thanks,
MAEDA Naoaki
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