Re: VST and Sched Load Balance

[Nick Piggin]

Srivatsa Vaddagiri wrote:

> Hmm ..I guess we could restrict the max time a idle CPU will sleep taking
> into account its balance interval. But whatever heuristics we follow to 
> maximize balance_interval of about-to-sleep idle CPU, don't we still run the 
> risk of idle cpu being woken up and going immediately back to sleep (because 
> there was no imbalance)?

Yep.

> Moreover we may be greatly reducing the amount of time a CPU is allowed to 
> sleep this way ...

Yes. I was assuming you get some kind of fairly rapidly diminishing
efficiency return curve based on your maximum sleep time. If that is
not so, then I agree this wouldn't be the best method.

--
SUSE Labs, Novell Inc.

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