On Saturday 23 June 2007, Paolo Ornati wrote:
> But the fact is, the "interactivity estimator" is too fragile, and when
> it fails it can do much damage.
>
>
> Fair scheduler instead:
> - are robust
> - provide consistent behaviour
> - provide good interactivity within the bounds of fairness
Yes, this is what I have concluded from this thread. Trying to guess which
tasks should have higher priority is not the right approach. It's not a CPU
scheduler's business to decide about priorities.
> > In my very simple test scenario the mainline scheduler
> > did behave much better.
>
> Of course... because of the two competing processes the
> "interactive" (for you) one needs 60%, that is more than it's 50% fair
> share.
>
> The real solution is to use nice levels so the scheduler doesn't have
> to guess what process is more important.
Yes, this seems to be the right approach from all the opinions I've heard.
> And yes, programs/distributions should set good defaults for you... and
> if they don't, just complain to them :)
I'm sure they'll do once a fair scheduler goes into mainline :)
I guess what I was missing from the beginning is that "fair" means that the
scheduler will be fair among tasks that have the same priority, but if a task
has a higher priority, it _will_ get more CPU. So we'll just have to mark
applications like video players, audio players or games with a high priority,
others like encoders or compilers with low priority, and leave the rest
(browsers, word processors, email readers, etc...) as normal priority. This
way a fair scheduler would be able to give each task right amount of CPU.
That sounds like a good solution to me.
Thanks,
Alberto.
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