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@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@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


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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