[LAU] motu 828 mkii latency

Pieter Palmers pieterp at joow.be
Tue Feb 12 08:01:59 EST 2008

Roman Muñoz Roncal wrote:
> Hi all,
> I'm trying to get a motu 828 mkii working on lenny-amd64
> I can't get it to run reliably at latencies lower than 8ms;  setting 
> qjackctl  about 5ms, the procces shows xruns/is killed by the watchdog; 
> setting it at 4 ms, it does not start.
> At 8 ms, it seems to work, not tested under load.
> kernel is 2.6.24-1
> qjackctl is 0.3.2
> libffado 1.999.14-876
> jackd version 0.109.2 tmpdir /tmp protocol 22
put your tmpdir on a shared memory filesystem (/dev/shm)

> Any hints about it?

Use realtime priority and a RT patched kernel.

Note that FFADO isn't supposed to work at very low latencies at the 
moment. I'd say 3x128 (=8ms) is about the limit of the current version. 
Will be better on the long run, but at the moment that's it.



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