[Ardour-Users] X Runs at Exactly 10 Minute Intervals

[Paul Symons]

On Wednesday 26 September 2007 19:38:49 Martin Lynch wrote:
> Thanks Paul - I hadn't thought of that - my system has a 320GB HDD with
> all my programs (including JACK) on it and another 2 X 320GB drives in a
> RAID 0 array - is there somewhere I could find a log of journaling
> activity?
>
> Paul Symons wrote:
> > On Wednesday 26 September 2007 18:44:28 Martin Lynch wrote:
> >> Hoping someone can help me figure out what's causing X runs at precisely
> >> 10 minute intervals - not 9:59, not 10:01 but exactly 10 mins.
> >>
> >> My setup:
> >>
> >> AMD 64 X2
> >> Feisty
> >> 2 GB DDR2 800 mhz
> >> M-Audio Firewire Solo using Freebob
> >> Sample rate: 96,000
> >> Periods: 3
> >> Frames: 64
> >> Latency: 2 ms
> >> Realtime checked in Qjackctl
> >> Priority = 89
> >> Qjackctl 0.2.21
> >>
> >> # ps -C jackd -cmL
> >> shows:
> >>
> >>   PID   LWP CLS PRI TTY          TIME CMD
> >> 24142     - -     - ?        00:14:40 jackd
> >>     - 24142 TS   20 -        00:00:00 -
> >>     - 24143 TS   24 -        00:00:00 -
> >>     - 24144 TS   24 -        00:00:00 -
> >>     - 24145 TS   24 -        00:00:00 -
> >>     - 24146 FF  139 -        00:00:00 -
> >>     - 24147 FF  129 -        00:05:51 -
> >>     - 24148 FF  132 -        00:00:00 -
> >>     - 24149 FF  132 -        00:00:00 -
> >>     - 29990 FF  139 -        00:00:00 -
> >>     - 29991 FF  133 -        00:00:25 -
> >>
> >> As I understand it, the FF indicates realtime.
> >>
> >> Messages from JACK:
> >>
> >> Load = 6.0202 max usecs: 44.000, spare = 622.000
> >> LibFreeBoB ERR: SLAVE XMT : Buffer underrun! 64 (0 / 256) (0 / 0 )
> >> 17:34:51.873 XRUN callback (2).
> >> FreeBoB MSG: xrun detected
> >> LibFreeBoB ERR: Xrun on connection 1
> >> load = 53.0101 max usecs: 3481.000, spare = 0.000
> >> load = 29.7333 max usecs: 43.000, spare = 623.000
> >>
> >> Load = 4.9502 max usecs: 25.000, spare = 641.000
> >> LibFreeBoB ERR: MASTER RCV: Buffer overrun!
> >> LibFreeBoB ERR: Xrun on connection 1
> >> 17:44:51.782 XRUN callback (3).
> >> FreeBoB MSG: xrun detected
> >> load = 4.4270 max usecs: 26.000, spare = 640.000
> >>
> >> Note that in the first instance it's an underrun; 2nd instance an
> >> overrun, which seems odd to me (ie I'd think with the X runs happening
> >> on such a precise schedule it would show the same problem each time).
> >>
> >> I've tried using System Manager to track down any processes which might
> >> be scheduled to run every 10 mins and can't pin down anything. I also
> >> tried stopping ntpd but the problem continued.
> >>
> >> Other programs which run simultaneously:
> >>
> >> - Beryl
> >> - Mythtv backend
> >>
> >> Using Ardour neither increases the X runs nor eliminates them - they
> >> still pop up at 10 min intervals.
> >>
> >> Any ideas or suggestions? Could Freebob be the problem? Are there system
> >> processes known to run at 10 min intervals that could be interfering?
> >>
> >> Also, not sure this has anything whatsoever to do with my X runs, but
> >> Qjackctl also reports a whole series of:
> >>
> >> QTextCursor::gotoParagraph Index: 49 out of range
> >> load = 4.1724 max usecs: 26.000, spare = 640.000
> >> load = 4.0381 max usecs: 26.000, spare = 640.000
> >> load = 3.9710 max usecs: 26.000, spare = 640.000
> >> QTextCursor::gotoParagraph Index: 49 out of range
> >> QTextCursor::gotoParagraph Index: 49 out of range
> >>
> >> I also tried running JACK from console, with the same results.
> >>
> >> Driving me nuts as every time I need to do a take, I have to wait until
> >> an X run hits, then I have a 10 min window to record, which leaves me
> >> thinking about the impending X run, rather than the part I'm playing!
> >>
> >> Many thanks!
> >
> > along with what Brett said, I think it can often be journalled file
> > systems committing as well.
> >
> > Paul



Hi Martin, I'm not sure about the specifics of the journal logging or commit 
times, though 

man mount 

may help. if your journalling filesystems are ext3 then you can actually mount 
them as ext2, which is one way of "turning off" the journalling.

hope that helps

Paul