Subject: Re: [linux-audio-dev] Low latency out-of-process vs in-process .. Re: Low Latency Kernel Combos
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Thu Jun 07 2001 - 15:29:32 EEST
On Thu, Jun 07, 2001 at 12:31:58AM +0200, Benno Senoner wrote:
> On Wed, 06 Jun 2001, Paul Davis wrote:
> > >But the experience with my lowlatency testing stuff tells me that it will be
> > >almost impossible to get 3msec latencies in an enviroment where multiple
> > >processere are involved.
> >
> > Unfortunately Benno, your (and my) intuition is wrong, as shown by the
> > testing that Abramo and Steve did about 3 weeks ago. In the extreme
> > cases, a requirement for in-process is the right thing to do.
>
> Interesting ... did they produce some simulations / stats / graphs / testing
> tools which are publicy available ?
> (if someone has links to mailarchives / sites handy please post them)
There are some graphs at http://plugin.org.uk/spmp/ I can't remeber the
significance of htem though, I think they were mostly run without realtime
scheduling. The code was Abramo's.
> I'm still a bit sceptical about the out-of-process and 3msec latencies,
> but if it turns out to be true, fine then.
I think we were all supprised, but it did work.
- Steve
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