[linux-audio-dev] NPTL/2.6 (was snd-hdsp oddities)

Charles de Martigny charles_dem at yahoo.com
Mon Jul 5 16:44:18 UTC 2004


--- Fernando Pablo Lopez-Lezcano <nando at ccrma.stanford.edu> wrote:
> On Mon, 2004-07-05 at 09:24, Michael Ost wrote:
> > On Thu, 2004-07-01 at 19:16, Paul Davis wrote:
> > > When the dust settles from the kernel and NPTL, 2.6 will be
> more
> > > viable. Right now, even though it works for some people, its
> not a
> > > generally viable platform for realtime audio.
> > 
> > What sort of issues are you seeing with NPTL and the 2.6 kernel?
> Are
> > there stability problems? Functionality problems? I thought I had
> heard
> > the NPTL/2.6 was working fine.
> 
> What I'm seeing is, sometimes, xrun storms (this is using 2.6.7 +
> some
> extra patches, lsm for realtime as non-root, recent alsa, qjackctl
> for
> starting and running jack). One of them I think I have tracked to
> an app
> running into denormal problems on a PIV. I still don't know for
> sure
> which part of the system is contributing to the problem (jack /
> nptl /
> alsa). On the same hardware with an older glibc and 2.4.x with low
> latency patches I don't see the same problems (but the whole distro
> is
> different, FC1 vs FC2). 
> 
> Some users have had good experiences with 2.6.x by turning off nptl
> with
> the LD_ASSUME_KERNEL trick, but they get lousy performance (ie:
> lots of
> xruns) with nptl on. 
> 
> -- Fernando
> 
> 
> 




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