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On 03/03/2013 03:29 PM, Gabbe Nord wrote:

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

>

> I disabled SpeedStep in BIOS, and it helped a little, thanks!

So the xruns are not completely gone? And what if you force the Lexicon

to only use 2 ins and outs with -i2 -o2? Could you also post your jackd

command (run JACK and check with ps -eo cmd | grep [j]ackd)
  Here's my

quoted text
> 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 =(.

>

Try

sudo modprobe -r snd-usb-audio && sudo modprobe snd-usb-audio
Does that revive MIDI again?
Jeremy
> Thanks again for your reply!

quoted text
>

>

>

>

> On Sun, Mar 3, 2013 at 1:04 PM, Jeremy Jongepier 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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>>>

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>

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