Re: [BUG] sched: fair group's bug

[Peter Zijlstra]

On Thu, 2009-01-08 at 09:30 +0800, Miao Xie wrote:
> I tested fair group scheduler on my hyper-threading x86_64 box(2 CPU * 2 HT)
> and found the deviation of the groups' CPU usage was larger than 2.6.26
> when *offline* a CPU or do hotplug frequently. It is less than 1% On 2.6.26ïbut
> On current kernel, it is often greater than 4%, even than 10% by accident.

Its not a bug -- a scheduler without smp awareness cannot be compared to
one without -- .26 just wasn't a complete group scheduler.

At best its a regression for your particular workload.

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