Op Monday 12 March 2007, schreef Con Kolivas:
quoted text
> > > If we fix 95% of the desktop and worsen 5% is that bad given how much
> > > else we've gained in the process?
> >
> > Killing the known corner case starvation scenarios is wonderful, but
> > let's not just pretend that interactive tasks don't have any special
> > requirements.
>
> Now you're really making a stretch of things. Where on earth did I say th=
at
quoted text
> interactive tasks don't have special requirements? It's a fundamental
> feature of this scheduler that I go to great pains to get them as low
> latency as possible and their fair share of cpu despite having a complete=
ly
quoted text
> fair cpu distribution.

As far as I understand it, RSDL always gives an equal share of cpu, but=20
interactive tasks can have lower latency, right? So you get in trouble with=
=20
interactive tasks only when their share isn't enough to actually do what th=
ey=20
have to do in that period, eg on a heavily (over?) loaded box. Staircase,=20
like mainline which gave them MORE than their share, would support that=20
(though this comes at a price).

So, if your box is overloaded to a great extend, X, which can use a lot of=
=20
cpu, can get unresponsive - unless it's negatively niced. But most other ap=
ps=20
aren't as demanding as X is, so they won't really suffer. Thus the problem =
is=20
mostly X. And at least part of that problem is being solved - X wasting cpu=
=20
cycles. Also, cpu's are getting stronger, and I think it's likely X's=20
relative CPU usage goes down as well.

In the long term, RSDL seems like the best way to go. Nice X down, and you =
got=20
most of the disadvantages. You still have the perfect fairness, no stalls a=
nd=20
starvation ;-)

If RSDL can be improved to help X, great. But introducing again the problem=
=20
which RSDL was supposed to solve would be pretty pointless. I think that's=
=20
what grumpy Con is trying to say, and he's right at it.

grtz

Jos

=2D-=20
Disclaimer:

Alles wat ik doe denk en zeg is gebaseerd op het wereldbeeld wat ik nu heb.=
=20
Ik ben niet verantwoordelijk voor wijzigingen van de wereld, of het beeld w=
at=20
ik daarvan heb, noch voor de daaruit voortvloeiende gedragingen van mezelf.=
=20
Alles wat ik zeg is aardig bedoeld, tenzij expliciet vermeld.