On Sun, 25 Oct 2009 11:40:16 +0100 rosea grammostola <rosea.grammostola@xxxxxxxxx> wrote: > Hi, > > I found this info: > > > "USB and jack > > The USB interrupt period is 1 msec. To be able to get lower latency > with jack when using it with an USB device, you have to use a setting > as 48kHz and 3 period. It will makes the buffer time a multiple of 1 > msec and you will get a much lower latency as with the default 2 > period. Additionaly, loading the snd-usb-audio with the parameter > "nrpacks=1" will give you a much lower latency (for this to work take > care that CONFIG_USB_BANDWIDTH is not set and > CONFIG_USB_DYNAMIC_MINORS is not set in your running kernel)." > > > http://proaudio.tuxfamily.org/wiki/index.php?title=Howto_RT_Kernel#USB_and_jack > > > 1) is this info still up-to-date? > 2) how do I exactly take care of this: > "Additionaly, loading the snd-usb-audio with the parameter > "nrpacks=1" will give you a much lower latency (for this to work take > care that CONFIG_USB_BANDWIDTH is not set and > CONFIG_USB_DYNAMIC_MINORS is not set in your running kernel)" > > (Debian (based) systems) > > \r In my experience 48kHz/3 periods works a bit more stable, the possible latency settings in jack don't really change, 64 frames is still the lower boundary and unstable. But I haven't heard about 2) and am very curious about this myself. Philipp _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
