On Sun, 25 Oct 2009 11:40:16 +0100In my experience 48kHz/3 periods works a bit more stable, the possible
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
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
2) Edit /etc/modprobe.conf or /etc/modprobe.d/modprobe.conf with:
options snd-usb-audio nrpacks=1
And to "make sure". you have to have the kernel options changed. make menuconfig, and press "/" to search for the two options.
Philipp: we already dealt with that one but _without_ substantial cause-and-effect http://bugs.archaudio.org/task/5
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