On Sun, May 13, 2012 at 4:06 PM, Robin Gareus <robin@xxxxxxxxxx> wrote: > Any hints on how to address this issue, then? If I understand correctly, > new USB2-class-compliant devices are not an issue, but on modern > machines with only EHCI, USB1-class-compliant devices may or may not > work... right? The primary problem with EHCI is only bandwidth allocation; it's inefficient. I'm unaware of any timing problems. That's not to say they don't exist, I just haven't run into them myself. Poor bandwidth efficiency aside, I usually see ~ the same latency and timing behavior on UHCi and EHCI with a TT. > Would forward porting your schedulers be an option? Has anything of this > been merged into recent kernels? I'm unlikely to do this unless I need it myself, sorry :-(. Not enough time, too much to do. And the kernel devs are absolutely right that replacing a working but inefficient driver with a brand new one that is faster but will require long-term testing is not something to be done lightly. > Maybe you can do play some tricks on the EHCI controller/scheduler: add > an old USB1.1 hub in between the soundcard and the PC... but that's just > a shot in the dark. You'll still be going through the translator in the root hub. Monty _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
