[PD] Audio latency on linux

[Roman Haefeli]

On Wed, 2023-05-10 at 19:04 +0200, Orm Finnendahl wrote:
> 
> jack_delay reports a 9.6 ms roundtrip delay through the analog
> outputs
> with a vector size of 64, so it is not the driver and in principle
> should be possible to get a lower latency in linux.

When using -callback (as Christof already suggested), you should get
exactly the same latency as measured by jack_delay. And in my
experience, that is indeed the case. 

While using the callback scheduler,  Pd used to hang after switching
audio backends. This is fixed in the Christof's scheduler_fix PR¹. I
hope this gets merged soonish. 

Roman

¹https://github.com/pure-data/pure-data/pull/1756 
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