Re: [LAU] Regular Xruns?

Arnold Krille wrote:
> Hi,
>
> On Friday 07 August 2009 02:11:01 James Stone wrote:
>> 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).
>
> That is good (and new) information. This sounds more like some clock-skews
> which run out of sync, then boom! a xrun and all is well again.
>
>> Any ideas what might be
>> going on? Could it be hardware-related??
>
> Follow Ken's advice: Use an RT-patched kernel.
>

OK.. done that now.. also set IRQ sched prio for sound card to 99, jackd
prio to 89, run the pci latency fix..

uname -a
Linux 2.6.29 #1 SMP PREEMPT RT Fri Aug 7 02:24:17 BST 2009 i686 GNU/Linux
  cat /proc/interrupts
            CPU0
   0: 119 XT-PIC-XT timer
   1: 976 XT-PIC-XT i8042
   2: 0 XT-PIC-XT cascade
   4: 4 XT-PIC-XT ehci_hcd:usb1
   5: 866799 XT-PIC-XT EMU10K1
   6: 5 XT-PIC-XT floppy
   7: 1711 XT-PIC-XT NVidia nForce2
   8: 0 XT-PIC-XT rtc0
   9: 0 XT-PIC-XT acpi
  10: 339411 XT-PIC-XT ohci_hcd:usb2, nvidia
  11: 546369 XT-PIC-XT ohci_hcd:usb3, eth0
  12: 3 XT-PIC-XT bttv0
  14: 11794 XT-PIC-XT ide0
  15: 47804 XT-PIC-XT ide1
NMI: 0 Non-maskable interrupts
LOC: 4999783 Local timer interrupts
SPU: 0 Spurious interrupts
CNT: 0 Performance counter interrupts
RES: 0 Rescheduling interrupts
CAL: 0 Function call interrupts
TLB: 0 TLB shootdowns
TRM: 0 Thermal event interrupts
ERR: 6
MIS: 0

~/jack_stuff$ ./irq_check 5
pid 2106's current scheduling policy: SCHED_FIFO
pid 2106's current scheduling priority: 99

#!/bin/sh

case $1 in
      start)
            # "open up" the PCI bus by allowing fairly long bursts for
all devices, increasing performance
            setpci -v -s "*:*.*" latency_timer=b0

            # maximise latency for SBLive!, thus allowing
            # more data per PCI transfer and minimizing xfuns
            setpci -v -s 01:0a.0 latency_timer=ff
esac

exit 0

But still get xruns every 14 mins!!!

08:34:43.555 JACK connection change.
08:34:43.563 JACK connection graph change.
08:49:02.342 XRUN callback (1).
**** alsa_pcm: xrun of at least 0.026 msecs
09:03:23.960 XRUN callback (2).
**** alsa_pcm: xrun of at least 0.026 msecs

James
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Received on Fri Aug 7 12:15:03 2009