[linux-audio-user] jack xruns on SUSE 9.3 with Edirol UA25 card - SOLVED

[Cesare Marilungo]

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
>>
>>
>>
>> 
>>    
>
>
>
>