Hi all, Trying to reduce the latency of jack on my ibook G4, i realised i can go down to 8.7ms using the oss mode, which is really good. But alsa won't accept running with less than 22ms and click on most X request: $ jackd -R -doss -r44100 -p128 -n3 -w16 works perfectly, 128*3/44100=8.7ms latency, hardly any xrun on heavy load $ jackd -R -doss -r44100 -p256 -n2 -w16 works fine, 11.6ms latency $ jackd -R -dalsa -r44100 -p128 -n3 -S runs but no clients can connect $ jackd -R -dalsa -r44100 -p256 -n2 -S fails saying ... ALSA: cannot set number of periods to 2 for capture ALSA: cannot configure capture channel $ jackd -R -dalsa -r44100 -p256 -n4 -S would run with 23.2ms latency, but xruns on most X queries It looks to me that this is related to the pmac driver. I have similar problems with snd-usb-audio and an edirol usb, which will only let jack run in oss mode. I wonder what prevents the pmac module to do so while the oss emulation layer does it very well. I am running 2.6.12-rc4, but had this problem with earlier 2.6 kernels. Any thoughts? Many thanks, Paul
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