We are already using a RT-kernel and I guess we already did everything we could do on OS changes to achieve a better latency. My doubt is if I can change anything on the snd-usb driver to make it specific to our sound card, aiming an improve in latency, since our pedalboard (http://portalmod.com/en/index.html) has this sound card fixed and we won't need a generic driver to the usb connection. I'm gonna send an e-mail to the alsa-devel ML, thanks for the advices!

2013/12/11 Clemens Ladisch <clemens@ladisch.de>

Lucas Takejame wrote:
> my task now is to make the kernel's usb audio driver more appropriate
> to our sound card.

What specific problem do you have?

> I was hoping that you could give me some directions on how can I
> optimize the driver latency wise, any tips?

For playback, you get lower latency by using a smaller buffer (which
also increases the chance of an underrun).

Regards,
Clemens

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Lucas Conejero Takejame

Engenharia Elétrica - ênfase em computação

Escola Politécnica - USP