Re: [RFC][PATCH] SCHED_ISO for interactivity

Daniel Phillips (
Mon, 14 Jul 2003 04:40:40 +0200

On Monday 14 July 2003 02:13, Con Kolivas wrote:
> On Mon, 14 Jul 2003 06:03, Daniel Phillips wrote:
> I'm not looking at creating a true realtime policy of any sort. Mine is
> more a dynamic policy change to an interactive state that is sustained,

That's clear.

> which gives no more capabilities to a normal user process than they can
> currently get on SCHED_NORMAL tasks. Audio will definitely get priority...

If you mean it will get a quick boost when it needs it, the trouble is, audio
doesn't need that just sometimes, it needs it all the time. Hence, the
tweaks you're doing are fundamentally unable to deliver the kind of audio
reliablity we'd like to become used to. That's not to denigrate the value of
your approach: it does seem to produce good effects in terms of interactive
response, but it's not a cure-all.

> along with any other interactive task, but not in a real time fashion.
> Basically they effectively get a nice -5 unless they do the wrong thing.

Yes, I noticed pretty quickly that if I wanted to get rid of the audio
glitches by renicing, I had to use nice -5 or lower.



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