Fwd: Re: Scheduler queues for less os-jitter?

[Uwaysi Bin Kareem]

------- Forwarded message -------
From: "Uwaysi Bin Kareem" <uwaysi.bin.kareem@xxxxxxxxxxxxxxxxxxxx>
To: "Mike Galbraith" <efault@xxxxxx>
Cc:
Subject: Re: Scheduler queues for less os-jitter?
Date: Sun, 04 Nov 2012 02:19:39 +0100

On Thu, 11 Oct 2012 04:46:34 +0200, Mike Galbraith <efault@xxxxxx> wrote:

> On Wed, 2012-10-10 at 20:13 +0200, Uwaysi Bin Kareem wrote:
> > I was just wondering, have you considered this?
> >
> > If daemons are contributing to os-jitter, wouldn`t having them all on
> > their own queue reduce jitter? So people could have the stuff like in
> > Ubuntu they want, without affecting jitter, or needing stuff like Tiny
> > Core, for tiny jitter?
> >
> > So you get (simplified) something like mainapp - process1 in queue 2,
> > mainapp - process2 in queue 2, mainapp - process 3 in queue 2, etc.
> >
> > Or is that already batch maybe, lol.
>
> You could try SCHED_AUTOGROUP, or create whatever task groups manually,
> or use systemd to do that for you.  Like everything else having anything
> to do with scheduling, all are double edged swords, so may help, may
> hurt.
>
> -Mike

Actually I did achieve this with fifo-relatime. Low jitter OpenGL seems to
be able to do, running the opengl app as realtime, with a low
sched_rt_period_us value and a high sched_rt_runtime_us value.

Peace Be With You.
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