[LAU] Regular Xruns?

[James Stone]

Arnold Krille wrote:
> On Thursday 06 August 2009 22:05:42 James Stone wrote:
>> Actually, I get xruns with qjackctl every 14 minutes...
> 
> That time is imho to long for the usual culprits like graphics or
> wireless.
> 
> Is your mail-app checking mails every 14 or 15 minutes? Is your
> instant messenger rechecking its connection?
> 
> Maybe cron is the reason as todays systems configure it so that it
> runs every quarter of an hour. I had that problem once (for me it was
> cron-triggered backups during recording sessions) and "solved" it by
> editing the systems crontab. It then only did the run-crons when
> "pidof jackd" didn't return a pid ie. if no jackd was running...
> 

Good ideas.. I tried to kill everything non-essential, but am still
getting an xrun every 14 minutes.. Here is the full top just 1 second
before the xrun occurred:

Tasks:  53 total,   1 running,  52 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.3%sy,  0.0%ni, 99.7%id,  0.0%wa,  0.0%hi,  0.0%si,
0.0%st
Mem:   1036260k total,   675232k used,   361028k free,    46480k buffers
Swap:  1967920k total,        4k used,  1967916k free,   486244k cached

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND

  2276 root      15  -5     0    0    0 S  0.7  0.0   0:00.86 kjournald

  9004 james     20   0 45760  44m  25m S  0.3  4.4   2:47.60 qjackctl

     1 root      20   0  2168  728  628 S  0.0  0.1   0:01.48 init

     2 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kthreadd

     3 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00
migration/0
     4 root      15  -5     0    0    0 S  0.0  0.0   0:00.18
ksoftirqd/0
     5 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/0

     6 root      15  -5     0    0    0 S  0.0  0.0   0:02.06 events/0

     7 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 khelper

    38 root      15  -5     0    0    0 S  0.0  0.0   0:00.18 kblockd/0

    41 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kacpid

    42 root      15  -5     0    0    0 S  0.0  0.0   0:00.00
kacpi_notify
   140 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kseriod

   175 root      20   0     0    0    0 S  0.0  0.0   0:00.00 pdflush

   176 root      20   0     0    0    0 S  0.0  0.0   0:00.84 pdflush

   177 root      15  -5     0    0    0 S  0.0  0.0   0:00.24 kswapd0

   178 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 aio/0

   720 root      15  -5     0    0    0 S  0.0  0.0   0:00.00
ksuspend_usbd
   723 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 khubd

   747 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 ata/0

   750 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 ata_aux

  1155 root      15  -5     0    0    0 S  0.0  0.0   0:00.20 kjournald

  1857 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kgameportd

  2275 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kjournald

  2280 root      15  -5     0    0    0 S  0.0  0.0   0:00.92 kjournald

  2281 root      15  -5     0    0    0 S  0.0  0.0   0:00.12 kjournald

  2282 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kjournald

  2283 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kjournald

  2284 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kjournald

  2285 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kjournald

  2286 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kjournald

  2287 root      15  -5     0    0    0 S  0.0  0.0   0:00.26 kjournald

  3269 root      20   0  1788  416  348 S  0.0  0.0   0:00.00 klogd

  4290 root      20   0 15636 1812 1132 S  0.0  0.2   0:00.00 gdm

  4293 root      20   0 16020 3152 2392 S  0.0  0.3   0:00.06 gdm

  4323 root      20   0 62496  46m 7268 S  0.0  4.6  16:24.08 Xorg

  4439 root      20   0  1784  524  460 S  0.0  0.1   0:00.00 getty

  4440 root      20   0  1784  524  460 S  0.0  0.1   0:00.00 getty

  4441 root      20   0  1784  528  460 S  0.0  0.1   0:00.00 getty

  4442 root      20   0  1784  524  460 S  0.0  0.1   0:00.00 getty

  4443 root      20   0  1784  524  460 S  0.0  0.1   0:00.00 getty

  4444 root      20   0  1784  524  460 S  0.0  0.1   0:00.00 getty

  4468 james     20   0  7152 1160  932 S  0.0  0.1   0:00.04
WindowMaker
  4605 james     20   0  9952 5520 3756 S  0.0  0.5   0:19.76
WindowMaker
  8429 james     20   0 12952 3184 2484 S  0.0  0.3   0:00.46 aterm

  8430 james     20   0  5300 1996 1344 S  0.0  0.2   0:00.00 bash

  9010 james     20   0 22080  21m 4144 S  0.0  2.1   0:45.02 jackd

  9642 james     20   0 13084 3300 2484 S  0.0  0.3   0:01.00 aterm


proc/interrupts:

            CPU0
   0:        229    XT-PIC-XT        timer
   1:       1349    XT-PIC-XT        i8042
   2:          0    XT-PIC-XT        cascade
   4:          2    XT-PIC-XT        ehci_hcd:usb3
   5:     357787    XT-PIC-XT        EMU10K1
   6:          5    XT-PIC-XT        floppy
   7:        127    XT-PIC-XT        NVidia nForce2
   8:          4    XT-PIC-XT        rtc
   9:          0    XT-PIC-XT        acpi
  10:     131847    XT-PIC-XT        ohci_hcd:usb1, nvidia
  11:     239397    XT-PIC-XT        ohci_hcd:usb2, eth0
  12:          3    XT-PIC-XT        bttv0
  14:      23608    XT-PIC-XT        ide0
  15:      20132    XT-PIC-XT        ide1
NMI:          0   Non-maskable interrupts
LOC:     402378   Local timer interrupts
RES:          0   Rescheduling interrupts
CAL:          0   function call interrupts
TLB:          0   TLB shootdowns
TRM:          0   Thermal event interrupts
SPU:          0   Spurious interrupts
ERR:          0
MIS:          0

uname -a

Linux 2.6.24-1-686 #1 SMP Thu May 8 02:16:39 UTC 2008 i686 GNU/Linux

So, you can see I am using a vanilla kernel, but the fact it's only
every 14 mins seems very strange to me. It is often preceded by a slow
build-up of static on audio output, which stops when the xrun happens
(this isn't recorded to disk in ardour tho).Any ideas what might be
going on? Could it be hardware-related??

James