Re: [ck] RSDL v0.30 cpu scheduler for mainline kernels

Ash Milsted
2007-03-13T15:31:54Z

On Mon, 12 Mar 2007 10:58:11 +1100
Con Kolivas <kernel@kolivas.org> wrote:

> There are updated patches for 2.6.20, 2.6.20.2, 2.6.21-rc3 and 2.6.21-rc3-mm2
> to bring RSDL up to version 0.30 for download here:
>
> Full patches:
>
> http://ck.kolivas.org/patches/staircase-deadline/2.6.20-sched-rsdl-0.30.patch
> http://ck.kolivas.org/patches/staircase-deadline/2.6.20.2-rsdl-0.30.patch
> http://ck.kolivas.org/patches/staircase-deadline/2.6.21-rc3-sched-rsdl-0.30.patch
> http://ck.kolivas.org/patches/staircase-deadline/2.6.21-rc3-mm2-rsdl-0.30.patch
>
> incrementals:
>
> http://ck.kolivas.org/patches/staircase-deadline/2.6.20/2.6.20.2-rsdl-0.29-0.30.patch
> http://ck.kolivas.org/patches/staircase-deadline/2.6.20.2/2.6.20.2-rsdl-0.29-0.30.patch
> http://ck.kolivas.org/patches/staircase-deadline/2.6.21-rc3/2.6.21-rc3-rsdl-0.29-0.30.patch
> http://ck.kolivas.org/patches/staircase-deadline/2.6.21-rc3-mm2/2.6.21-rc3-mm2-rsdl-0.29-0.30.patch
>
> --
> -ck
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Here's my experience with RSDL 0.30 on 2.6.21-rc3-git6 under my normal
usage scenarios...

Plain desktop use (web browsing, music, etc): no noticeable change

Desktop use during kernel compile (no -j): The compile impacts desktop
use more with RSDL, but this is easily solved by nice-ing the compile
(default nice of 10 seems enough). The kind of impact I am talking about
is e.g. occasional delays in scrolling in the browser etc.

Desktop use whilst talking on Wengophone (run at nice -5): Under RSDL
some GUI use e.g. opening a new folder in nautilus causes pops (buffer
underruns) which do not occur with mainline. I suppose the changes in
RSDL might require a lower nice value for equivalent performance, but
(as a user) I am limited to -5.

Low-latency audio with JACK and Ardour2: Rock-solid performance with
either scheduler.. realtime works nicely.

Playing Quake3 (proprietary nvidia driver): Plays smoothly for both
schedulers.

So, I suppose I'd like to know what to do about the Wengophone issue,
because that really is a problem for me. I guess your re-worked -ive
nice values might help?

Ash