diagnostic tools to trace the reason xruns are happening?

Hartmut Noack zettberlin at linuxuse.de
Sun Jun 5 17:39:45 UTC 2011

Am 05.06.2011 11:00, schrieb Robert Klaar:
> What happens if you set the frames/period settings higher? I have similar
> setup and can't get it to run on any lower than 1024 frames(if I want to
> avoid xruns), but then I've set the sample rate to 48000. I've never noticed
> any problems with the latency, it's at 46 or something now but I can't hear
> any difference between this and something lower, can you? .)

Yes I can.

I work with musicians and my experience is:

lower than 5ms: nobody noticed that in comparison with 10ms

5-10ms: everything fine, no complaints

around 16ms: all but some singers realise that something is going on, 
faces grow longer, some demand changes.

For very big projects on lesser machines I run Jack with 30 or more ms 
latency. It is OK for mixing/editing etc but I do not record any 
overdubs with such settings. I remember I did some years ago but it 
really was not fun and the results where not as good as they could have 

Any recent Linux sould allow settings for 16ms or lower for normal load. 
If it does not, I try the standard-procedures to fix it, if this does 
not help I switch the distro.

best Regs


> Best,
> Robert
> On Sun, Jun 5, 2011 at 10:24 AM, bart deruyter<bart.deruyter at gmail.com>wrote:
>> Hi all,
>> since recently I'm experiencing more xruns in ubuntustudio 11.04, more
>> specifically using the lowlatency kernel. My audiocard is an external one,
>> firewire, and I use the firewire driver. They just started happening out of
>> the blue, without changing anything significantly. These xruns happen
>> randomly, not caused by anything I do on the desktop. When I keep qjackctl
>> running without any audio apps open, now and then, about each half hour, or
>> 20 minutes, there is an xrun.
>> My limits.conf file seems to be as described on the wiki's over the web, I
>> have 4 GB or ram, a duocore processor.. I see no reason for problems.
>> I've got a latency of 17.4 msec, with a setting of 256 Frames/Perios,
>> Sample Rate of 44100, and 3 Periods/Buffer. So far this was the most stable
>> setup, though I'm sure I should be able to go to 128 Frames/Period with my
>> AudioFire12. But I can't, more xruns happen when using this setting. Setting
>> the samplerate higher I get more xruns too. I'd love to record on 96000, or
>> even 192000, which is possible with the audiocard, but the computer system
>> prevents this because of these xruns.
>> This does make it unreliable for recording, which I want to do more
>> regularly and it makes me impossible to do recordings for others. I do not
>> want a system where I have to ask people to start playing again for the
>> recording because xruns.
>> So, I was wondering, are there diagnostic tools, test scrips, tracing tools
>> to get me to the bottom of this?
>> Grtz,
>> Bart
>> http://www.bartart3d.be/
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