[LAU] Issues with JACK

Sun Mar 3 14:29:33 UTC 2013

Hello Jeremy, and thank you so much for your reply!

I disabled SpeedStep in BIOS, and it helped a little, thanks! Here's my
interrupts:

zth at zth:~$ cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3
  0:         43          0          1          1   IO-APIC-edge      timer
  1:          3          0          0          0   IO-APIC-edge      i8042
  8:          1          0          0          0   IO-APIC-edge      rtc0
  9:          0          0          0          0   IO-APIC-fasteoi   acpi
 12:          4          0          0          0   IO-APIC-edge      i8042
 23:     412535      22606         20         25   IO-APIC-fasteoi
ehci_hcd:usb1, ehci_hcd:usb2
 41:      12871        435        437        292   PCI-MSI-edge      ahci
 42:          0          0          0          0   PCI-MSI-edge
xhci_hcd
 43:         67          9          3          8   PCI-MSI-edge      eth0
 44:          9          3          1          0   PCI-MSI-edge      mei
 45:         78        161         80         19   PCI-MSI-edge
snd_hda_intel
 46:      87524         15         46         18   PCI-MSI-edge      radeon
 47:         29          0          0          0   PCI-MSI-edge
snd_hda_intel
NMI:        171        188        137        145   Non-maskable interrupts
LOC:     393823     587985     553269     586297   Local timer interrupts
SPU:          0          0          0          0   Spurious interrupts
PMI:        171        188        137        145   Performance monitoring
interrupts
IWI:          0          0          0          0   IRQ work interrupts
RES:      33948      43230      37004      44438   Rescheduling interrupts
CAL:       4737       2603       2357       2402   Function call interrupts
TLB:       8090       6659       7185       7658   TLB shootdowns
TRM:          0          0          0          0   Thermal event interrupts
THR:          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0   Machine check exceptions
MCP:        116        116        116        118   Machine check polls
ERR:          0
MIS:          0

I tried alsa-reload but it didn't help =(.

Thanks again for your reply!

On Sun, Mar 3, 2013 at 1:04 PM, Jeremy Jongepier <jeremy at autostatic.com>wrote:

> On 03/03/2013 11:47 AM, Gabbe Nord wrote:
>
>> Hello!
>>
>> I'm experiencing some weird issues with JACK. I got a new system the other
>> day, and I'm tweaking it for linux audio only basically. My issues are:
>> even when dsp load isn't even close to 100%, I get xruns. This only
>> happens
>> at lower latencies, but still. My setup is as follows :
>>
>> Kxstudio 12.04.2
>> 3.2 realtime kernel (tried lowlatency and generic aswell)
>> Usb sound card Lexicon Omega
>> Realtimeconfig quickscan shows everything green except cpu governors, but
>> I'm pretty sure I don't have that on this system? It's an Intel i5 3570k
>> desktop. Or maybe there's some setting in BIOS equivalent of cpu
>> governors?
>> If so that might very well be the problem.
>>
>>
> Hello Gabbe,
>
> You can check what governor is in use with:
> cat /sys/devices/system/cpu/cpu*/**cpufreq/scaling_governor
>
> And set it to a non-scaling governor with:
> echo -n performance | sudo tee /sys/devices/system/cpu/cpu*/**
> cpufreq/scaling_governor
>
> You can also disable it in your BIOS, it's probably called something like
> SpeedStep. More info: http://wiki.linuxmusicians.**com/doku.php?id=system_
> **configuration#cpu_frequency_**scaling<http://wiki.linuxmusicians.com/doku.php?id=system_configuration#cpu_frequency_scaling>
>
>
>  I use JACK at 48khz 3 periods/buffer. I start it via falktx's Cadence.
>>
>> Any ideas about this?
>>
>>
> Please post the output of:
> cat /proc/interrupts
>
>
>  Also! When I'm asking for help anyway... I connect my MIDI keyboard via
>> MIDI in on my sound card, but that suddenly stopped working. The midi out
>> from the sound card is present in JACK, but it delivers no midi. Any idea
>> on where to start troubleshooting this?
>>
>>
> Did you try other USB ports? Or issueing a:
> sudo alsa force-reload
> Does that help?
>
> Regards,
>
> Jeremy
>
>  Thank you so much for taking the time to read this. Cheers!
>>
>>
>>
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>>
>>
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