Re: [RFC][PATCH] SCHED_ISO for interactivity

Con Kolivas (
Mon, 14 Jul 2003 00:06:13 +1000

On Sun, 13 Jul 2003 21:54, Christian Axelsson wrote:
> On Sun, 2003-07-13 at 12:41, Guillaume Chazarain wrote:
> > Hi Con,
> >
> > I am currently testing SCHED_ISO, but I have noticed a regression:
> > I do a make -j5 in linux-2.5.75/ everything is OK since gcc prio is 25.
> > X and fvwm prio are 15, but when I move a window it's very jerky.
> It's pretty smooth on my desktop (t-bird 1.4, 512mb ram, nvidia)

Probably faster hardware. I think I'll decrease the iso penalty to just 1/2
sized timeslices (ISO_PENALTY 2)

> > BTW2, you all seem to test interactivity with xmms. Just for those like
> > me that didn't noticed, I have just found that it skips much less with
> > alsa's OSS emulation than with alsa-xmms.
> I will try that out, seems to work so far, intressting...

The logical conclusion of this idea where there is a dynamic policy assigned
to interactive tasks is a dynamic policy assigned to non interactive tasks
that get treated in the opposite way. I'll code something for that soon, now
that I've had more feedback on the first part.


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