Hello, I have this strange issue. Jack reports an xrun in every exact 20 minutes:
**** alsa_pcm: xrun of at least 1.703 msecs 18:59:17.219 XRUN callback (1). **** alsa_pcm: xrun of at least 0.134 msecs 19:29:16.764 XRUN callback (2). **** alsa_pcm: xrun of at least 0.511 msecs 19:49:16.459 XRUN callback (3). **** alsa_pcm: xrun of at least 0.828 msecs 21:09:15.244 XRUN callback (4).
I think it is something that is scheduled in system. However there is i indication of any kind of load at that instant, this also happens when the computer look and feels fully idle.
I'm running Ubuntu Feisty with low latency kernel. What can it be? Any suggestions?
Thanks!
wow, an xrun only every 20minutes.. i'd be glad to have that (even because it is so reliable) ;-)
roman
On Fri, 2007-09-07 at 21:14 +0300, Batuhan Bozkurt wrote:
Hello, I have this strange issue. Jack reports an xrun in every exact 20 minutes:
**** alsa_pcm: xrun of at least 1.703 msecs 18:59:17.219 XRUN callback (1). **** alsa_pcm: xrun of at least 0.134 msecs 19:29:16.764 XRUN callback (2). **** alsa_pcm: xrun of at least 0.511 msecs 19:49:16.459 XRUN callback (3). **** alsa_pcm: xrun of at least 0.828 msecs 21:09:15.244 XRUN callback (4).
I think it is something that is scheduled in system. However there is i indication of any kind of load at that instant, this also happens when the computer look and feels fully idle.
I'm running Ubuntu Feisty with low latency kernel. What can it be? Any suggestions?
Thanks!
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If I made a guess I would check disks spinning up/down, power management settings, things of that nature which may not necessarily show in the CPU... but this is a really uneducated guess. Like Roman said though, I would also be glad to only have xruns every 20 minutes! Do you get xruns without any apps running and just jack?
Kevin
On 9/7/07, Batuhan Bozkurt batuhan@batuhanbozkurt.com wrote:
Hello, I have this strange issue. Jack reports an xrun in every exact 20 minutes:
**** alsa_pcm: xrun of at least 1.703 msecs 18:59:17.219 XRUN callback (1). **** alsa_pcm: xrun of at least 0.134 msecs 19:29:16.764 XRUN callback (2). **** alsa_pcm: xrun of at least 0.511 msecs 19:49:16.459 XRUN callback (3). **** alsa_pcm: xrun of at least 0.828 msecs 21:09:15.244 XRUN callback (4).
I think it is something that is scheduled in system. However there is i indication of any kind of load at that instant, this also happens when the computer look and feels fully idle.
I'm running Ubuntu Feisty with low latency kernel. What can it be? Any suggestions?
Thanks!
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Kevin McCoy wrote:
If I made a guess I would check disks spinning up/down, power management settings, things of that nature which may not necessarily show in the CPU... but this is a really uneducated guess. Like Roman said though, I would also be glad to only have xruns every 20 minutes! Do you get xruns without any apps running and just jack?
Kevin
Yes, jack alone reports xruns too. If cpu-disk load is low I get no xruns other than this periodic ones with my Fasttrack pro in 256 buffers. I like the low latency kernel, am gonna try the realtime kernel that is gonna be shipped by gutsy soon.
And my disk is always running so that should not be I guess...
Is there any facility in linux where I can monitor scheduled activities by the system or something like that?
Batuhan
Check the linux-audio-user list archives regarding the filesystem you use with JACK. I recall that ext3 gives huge problems, other file systems may have their own issues. The hangup involves how and where JACK writes its temporary files. You can also use a jacktmpfs (I think that's what it's called). Anyways, LAU will have more info.
d.
Batuhan Bozkurt wrote:
Kevin McCoy wrote:
If I made a guess I would check disks spinning up/down, power management settings, things of that nature which may not necessarily show in the CPU... but this is a really uneducated guess. Like Roman said though, I would also be glad to only have xruns every 20 minutes! Do you get xruns without any apps running and just jack?
Kevin
Yes, jack alone reports xruns too. If cpu-disk load is low I get no xruns other than this periodic ones with my Fasttrack pro in 256 buffers. I like the low latency kernel, am gonna try the realtime kernel that is gonna be shipped by gutsy soon.
And my disk is always running so that should not be I guess...
Is there any facility in linux where I can monitor scheduled activities by the system or something like that?
Batuhan
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Hallo, Derek Holzer hat gesagt: // Derek Holzer wrote:
Check the linux-audio-user list archives regarding the filesystem you use with JACK. I recall that ext3 gives huge problems,
That must have been long ago: ext3 currently (i.e. with a current kernel) is one of the recommended filesystems to use, while reiserfs is a latency hog and should be avoided.
Ciao
Frank Barknecht _ ______footils.org_ __goto10.org__
Entirely possible that it was too long ago... I tangled with these issues in 2002-3...
d.
Frank Barknecht wrote:
Hallo, Derek Holzer hat gesagt: // Derek Holzer wrote:
Check the linux-audio-user list archives regarding the filesystem you use with JACK. I recall that ext3 gives huge problems,
That must have been long ago: ext3 currently (i.e. with a current kernel) is one of the recommended filesystems to use, while reiserfs is a latency hog and should be avoided.
Ciao
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Batuhan Bozkurt -
Derek Holzer -
Frank Barknecht -
Kevin McCoy -
Roman Haefeli