I solved the problem *cough* disabling the ethernet card. Don't know why it worked randomly yesterday. It works even with the nvidia accelerated driver. And no more glitches with -p64 -n4. 5.8ms of total latency with a USB card is better than my old Egosys 2496 (pci) which made Cubase on XP unstable with a buffer less than 512. Interestingly, the nrpacks parameter of the snd_usb_audio module is set to 4 (instead of 1 as people suggested on the net). Thank you, anyway. c. Cesare Marilungo wrote: >Ubuntu had 2.6.10 something with realtime-lsm module. > >On Suse I haven't recompiled the kernel. Just the realtime module, with >the patched kernel. > >It's the one shipped with Suse 9.3 (2.6.11.4-21.7-default). > >I forgot to mention that before than that I also tried with a custom >compiled vanilla 2.4.11.7 with rt-lsm and realtime-preempt patches and >got loads of xruns. > >Anyway yesterday I pushed jack settings way to 5ms latency (p128 -n3 >with 24bits, 44.100k, 2 ins, 2 outs). >Is it possible to achieve such low latency for USB 1.1 card? > >I doubt I had two instances of jack running, changed settings on the >frontmost qjackctl, and listened to the output from the first instance. >I disconnected and reconnected Muse and Zyn various times to change the >buffer size. And I also noticed the degradation of sound when pushing >jack settings so too far. > >I haven't had any xrun. Even when connecting apps. > >c. > >Lee Revell wrote: > >>On Thu, 2005-07-28 at 01:18 +0200, Cesare Marilungo wrote: >> >> >>>Hi, >>>I'm going crazy!!! >>> >>>Last night, after some months playing with Ubuntu, I installed SUSE 9.3 >>>on my amd64 with an Edirol UA-25. I installed the kernel source, patched >>>it with rt-lsm.patch, built the modules, installed ect. >>>Added: >>> >>> >>Were the kernel versions different between the two systems? >> >>USB audio is known to have some problems with older 2.6 kernels. >> >>Lee >> >> >> >> >> > > > >
