27 Oct
2008
27 Oct
'08
9:38 a.m.
Rui Nuno Capela wrote:
midi is seriously broken on 2.6.26-rt, specially when
driven outboard;
events delivered out of time if at all, outrageous jitter and
unpredictable drop outs; internally sequenced material (eg. queueing
events to a softsynth) might work barely but that is just little comfort.
note that this badness applies to PREEMPT_RT kernels >= 2.6.26, vanilla
is fine afaict.
all that trouble seems to be related to a regression in 2.6.26-rc2 that
just made the bkl non preemptible anymore, leaving the -rt people with a
herculean task to comply--look after Ingo Molnar's "Kill the BKL" tree
for news...
I keep hearing rumors that the kernel devs are basically trying to make
the vanilla kernel "rt-capable", meaning I think that they want to make
special patching unnecessary for the task. What we're seeing now are
side-effects of this effort, which will hopefully right itself soon.
Only rumors, I'm afraid. If someone out there has some real knowledge on
this issue, feel free to speak up. :-)
-- Darren