19 Dec
2011
19 Dec
'11
3:11 p.m.
Hi Dave,
On 12/19/2011 03:12 PM, Dave Phillips wrote:
Greetings,
A quick update on the problem. Two things appear to have helped
considerably: I now run the rtirq script to optimize the IRQ
assignments, and I set the sr for my Delta 66 to 48k, the same rate as
JACK. It had been set at 44.1 with JACK running at 48k. Whoops.
A3 is much happier, even without the rt-patched kernel
The important parts - regarding low latency audio - of the RT patch have
been in mainline since 2.6.39.
but I intend to
build and install the 3.0-rt sources anyway.
While in general this is beneficial, it's much easier to get it wrong
than get it right.
Unless you aim for very low latencies < 2ms or need to have 100%
[software,scheduler] reliability (for on-stage performances) a default
voluntary-preemt kernel with 'threadirq' should be sufficient. YMMV.
Personally I have not yet succeeded to compile a re-usable reliable
3.0.X-rt; Some revisions require nohz option, some others have problems
with suspend/resume and/or power-off. It's a bit of a kludgy situation.
However it is possible to get a reasonably stable desktop:
3.0.6-rt17+ SMP PREEMT x86_64 has an uptime of 68 days here, zero x-runs
since then with jackdmp 1.9.7 @64f/p * 3p/c.
I have not yet tried 3.2-rc5-rt7
My thanks to everyone who responded, I appreciate the
assistance.
Best,
dp
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