On 02/14/2012 08:31 PM, Brian Monroe wrote:
I've been spending a lot of time on the #opensourcemusicians channel
talking to Ubuntu Studio users about their kernel and latency times
they're getting. Seems like most of them are using g a stock kernel with
the preemptive option enabled and they are getting great latency results
(2ms)while utilizing the @audio group on their user. I ended up
compiling my own low latency kernel and I haven't had any issues with it
yet. If this is what we are missing for the spin I'd be happy to
maintain packaging for the kernel. I know ccrma has been behind a few
kernel releases.
Latency times are really relative things based on many factors. Have you
been getting better latency times than ta
Currently 3.2.2-1.rt10.1 is in CCRMA testing (which is only one behind
upstream which I believe Fernando has already started working on)
The patches are taken from here:
http://www.kernel.org/pub/linux/kernel/projects/rt/
I saw the instructions for adding the real time patch for a tick less
kernel and from what I can tell it wouldn't be hard to get that rolling
as well.
I'm not entirely sure what ccrma does differently with their kernels
compared to other Linux users, and I'm still a bit of a noob so I could
be off base with this, but I would reason that we should be able to just
utilize the same settings to archive similar performance enhancements.
That question might be better directed towards CCRMA.
I haven't got that far yet but I would imagine that any kernel shipped
with a Fedora endorsed spin would have to be generated by the kernel
team (ie, from the Fedora build system). Having said that, latency times
achieved using the stock kernels w/threadirqs and our standard jack
limits.conf are more than sufficient for most users.
I thought I read that ccrma uses a unique scheduler, but if we could get
a 2ms latency time without it, the point may be moot.
Brendan
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