Re: [a-devel] AGNULA/DeMuDi 1.1.1 and 2.6.x kernel

[Free Ekanayaka <free@agnula.org>]

>>>>> On 02 Jun 2004 21:03:50 -0700, Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU> said:

    Fernando> On Tue, 2004-05-25 at 17:41, Fernando Pablo
    Fernando> Lopez-Lezcano wrote:
    >> > seems that some people have done some deeper tests ( Fernando
    >> Pablo > Lopez-Lezcano for ex.) which havr shown than the 2.6.x
    >> kernel is not > good enugh yet for audio production.  Maybe it
    >> worth to take this into > consideration.
    >> 
    >> And then maybe not :-)
    >> 
    >> Another data point, I just (finally) booted into FC2 (that
    >> comes native with 2.6.x/ALSA) using 2.4.26-1.ll+ALSA (as built
    >> on FC1). I still get xruns. Much less than with 2.6.x but they
    >> are there nevertheless. So there is something other than 2.6.x
    >> messing things up (I suspect the xorg X server, but have no
    >> hard data to back the claim).

    Fernando> So now I know (sort of) what was going on. The culprit
    Fernando> was not the kernel.  The culprit was not xorg.

    Fernando> The culprit was a change in behavior of pthread_create
    Fernando> (what it is related to I don't know yet, I assume this
    Fernando> change is part of glibc - I just found out a few minutes
    Fernando> ago). That change means that the current jack code,
    Fernando> together with glibc or whatever it is that changed in
    Fernando> FC2, creates threads for the jack clients that are _not_
    Fernando> SCHED_FIFO (but jack itself is still SCHED_FIFO). You
    Fernando> can imagine that that can cause xruns :-)

    Fernando> I just did a test with a hacked jack and things are back
    Fernando> to normal (meaning that it should be now possible to
    Fernando> really test 2.6.6 in my environment for low latency
    Fernando> behavior).

Fernando, thanks for this deep analysis of the issue.

I'd like    to   know whether   this  bug    holds even  for    Debian
glibc/2.6.x. If this  is the case  I think that A/DeMuDi should really
stick to 2.4.x until the jack code is fixed upstream.

What do you all think about this?

cheers,

free