Re: [LAD] JACK + PA Latency

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To: <linux-audio-dev@...>
Date: Sunday, September 29, 2013 - 7:57 am

On Sat, September 28, 2013 6:53 am, Fons Adriaensen wrote:

The PA Devs are aware of my results and have been very helpful so far. We
are getting into a murky area where the code has not been worked on
recently so it takes time to refresh on the specifics.

With the differing results from jack_iodelay and jack_delay that has
unfortunately thrown a spanner in the works. Now I have to *prove* that
the new results are completely reliable. That's not an attack on your
work, just that now I have a new variation that needs to be fully
explained to make sure there is no doubt, otherwise it's likely that
fingers will point in other directions.

Some additional empirical data and test results from other people will be
helpful too.

I have compiled the test procedure into a basic document now:

http://boosthardware.com/pa-jack-latency-test.txt

To recap some of the "results" so far are :

- The combination of JACK + PA is stable on my machine for several days in
a row even at 64 frames/period and using hda_intel onboard device
- PA Stream Buffer can give consistent 10ms latency
- I am now seeing latency between 16ms to 75ms with the new version of
jack_delay

- There appears to be a bug in the official jack_iodelay which is part of
the jack utility app suite.

--
Patrick Shirkey
Boost Hardware Ltd
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Messages in current thread:
[LAD] JACK + PA Latency, Patrick Shirkey, (Fri Sep 27, 2:42 pm)
Re: [LAD] JACK + PA Latency, Fons Adriaensen, (Fri Sep 27, 3:29 pm)
Re: [LAD] JACK + PA Latency, Patrick Shirkey, (Fri Sep 27, 4:47 pm)
Re: [LAD] JACK + PA Latency, Patrick Shirkey, (Fri Sep 27, 5:09 pm)
Re: [LAD] JACK + PA Latency, Fons Adriaensen, (Fri Sep 27, 8:53 pm)
Re: [LAD] JACK + PA Latency, Patrick Shirkey, (Sun Sep 29, 7:57 am)
Re: [LAD] JACK + PA Latency, Paul Davis, (Mon Sep 30, 12:19 am)
Re: [LAD] JACK + PA Latency, Fons Adriaensen, (Mon Sep 30, 11:50 am)
Re: [LAD] JACK + PA Latency, Patrick Shirkey, (Mon Sep 30, 12:15 pm)
Re: [LAD] JACK + PA Latency, Fons Adriaensen, (Mon Sep 30, 1:30 pm)
Re: [LAD] JACK + PA Latency, Patrick Shirkey, (Mon Sep 30, 2:04 pm)
Re: [LAD] JACK + PA Latency, Fons Adriaensen, (Mon Sep 30, 3:33 pm)
Re: [LAD] JACK + PA Latency, Paul Davis, (Mon Sep 30, 3:39 pm)
Re: [LAD] JACK + PA Latency, Patrick Shirkey, (Tue Oct 1, 5:22 am)
Re: [LAD] JACK + PA Latency, Ralf Mardorf, (Tue Oct 1, 8:59 am)
Re: [LAD] JACK + PA Latency, Ralf Mardorf, (Sat Sep 28, 2:41 am)