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SubjectRe: Question about fair schedulers
Date
Alberto Gonzalez wrote:
> On Saturday 23 June 2007, Tom Spink wrote:
>> Alberto,
>>
>> If you're feeling adventurous, grab the latest kernel and patch it
>> with Ingo's scheduler: CFS.
>>
>> You may be pleasantly surprised.
>
> Thanks, I might if I have to courage to patch and compile my own kernel :)
>
> However, I'd also need to change all my applications to set them with the
> right priority to see the good results, so I think I might just wait until it
> lands in mainline.

In general not the case. I generally don't diddle my priorities, there's
rarely a need.
>
> Just to check if I understood everything correctly:
>
> The mainline scheduler tries to be smart and guess the priority of each task,
> and while it mostly hits the nail right in the head, sometimes it hits you
> right in the thumb.
>
> Fair schedulers, on the contrary, forget about trying to be smart and just
> care about being fair, leaving the priority settings to where they belong:
> applications.
>
> Is this more or less correct?

Incomplete. The CFS scheduler seems to do better with latency, so you
may get less CPU to a process but it doesn't wind up waiting a long time
to get a fair share. So it "feels better" without micro tuning.

Face it, if you have more jobs than CPU no scheduler is going to make
you really happy.
>
> Alberto.
>


--
Bill Davidsen <davidsen@tmr.com>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot

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