[pulseaudio-discuss] Need help to reduce delay with USB, mic using pulseaudio

Pierre-Louis Bossart pierre-louis.bossart at linux.intel.com
Fri Aug 26 09:04:58 PDT 2011

Works for me for usb->hdaudio loopback. i get a latency < 40ms 
See log at http://pastebin.com/jWC57PcT

I suspect your alsa soc driver doesn't report the latency accurately.
Interestingly the latency you have is very close to the period size
(64k). Try changing the fragment size in (usr)/etc/pulse/daemon.conf and
check if you see any difference in latency.

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