[linux-audio-user] Edirol UA-25: Any issues?

Christoph Eckert ce at christeck.de
Sat Nov 19 19:22:22 EST 2005


> I can get 11ms without issues or 5ms (sometimes even less when the
> setup is simple) with this card. But on some distros I had to disable
> my ethernet adapter. Are you sure you don't have some heavy process
> or server running?

No server or process is running, except for KDE ;-) .

It is likely that my interrupts cause problems. Thanks to the post of  
"thewade" I found on my machine:

cat /proc/interrupts
  0:    1320101          XT-PIC  timer
  1:       3169          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  8:          2          XT-PIC  rtc
 11:    1311823          XT-PIC  Intel 82801CA-ICH3, Intel 82801CA-ICH3 
Modem, uhci_hcd:usb1, uhci_hcd:usb2,eth0, yenta, yenta, ohci1394, 
 12:        114          XT-PIC  i8042
 14:      51597          XT-PIC  ide0
NMI:          0
LOC:          0
ERR:          0
MIS:          0

It seems that interrupt 11 is a bit overcrowded, but I have no clue how 
to put the USB bus to another IRQ.

> Also, I load the realtime module with the parameter any=1. I know
> this could be less stable, but its worth if you need to record your
> music without interruptions and with a low latency.

If I understood correctly, the realtime module does nothing else than 
grant non-root-users access to realtime priorities. It doesn't change 
any further latency settigns on your machine.

> p.s. Please guys help me with my UA-20. :-(

I'm sorry, but I really have no knowledge to help you on this issue.

Best regards


»Wer Visionen hat, sollte zum Arzt gehen« (Helmut Schmidt)

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