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

Ryan ruinaudio at comcast.net
Thu Jul 28 03:59:01 EDT 2005


On Thu, 2005-07-28 at 08:07 +0200, Cesare Marilungo wrote:
> I solved the problem *cough* disabling the ethernet card. Don't know why
> it worked randomly yesterday.

I can confirm this problem/solution.  UA25 glitchy as heck till eth0 is
disabled.  I have a dell inspiron 5100 running gentoo btw.

Makes icecast streaming jackd a bit tough, but at least it works.

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



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