On 09/17/2011 08:14 AM, Frank Kober wrote:
----- Mail original -----
De : Paul Davis<paul@xxxxxxxxxxxxxxxxxxxxx>
À : linux-audio-user<linux-audio-user@xxxxxxxxxxxxxxxxxxxx>
Cc :
Envoyé le : Vendredi 16 Septembre 2011 19h33
Objet : lowest usable latency from a USB 1 device?
if you can run a USB 1 class compliant audio device on your linux
system with lower latency than the current minimum so far posted to
this thread, please post with the settings you use and the type of
device. if your best performance has already been posted, no need to
repeat it.
i'll get the ball rolling with 2048 frames. note that we are assuming
2 channels only, but duplex mode (simultaneous capture+playback).
thanks.
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As some others here:
Edirol UA-25 with
nperiods 3, frame size 128, 2x2 (duplex) 48kHz
without any problems on a 2.6.33.6-1.rt26 kernel and some sporadic xruns on a 3.1.0-rc5
Same device here, Edirol UA-25. Lowest possible latency I can achieve is
2ms (48 frames/period, 48 Khz sample rate and 2 periods/buffer) but that
isn't very usable. It runs in a pretty stable manner at 64/48000*3 (4ms)
but just to be sure I mostly use 128 frames/period.
Best,
Jeremy
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