5 Mar
2005
5 Mar
'05
4:20 a.m.
OK, So as per these several suggestions, I've now tried the US428
with a vanilla 2.6.11, a 2.6.11 with Ingo's preempt patch and
full preemption, nrpacks=4, apm and acpi not compiled in the
kernel, and without my usb ethernet card plugged in. I'm still
getting the "Sequence Error!" messages, then a couple seconds
later qjackctl dissapears.
I still haven't tuned the IRQ stuff, because I'm still getting
the error of:
execvp: No such file or directory
failed to execute pidof "IRQ 8"
when I try to execute chrt -f -p 80 'pidof "IRQ 8"' I'm not sure
what do do
about that one, and google and man don't seem to help me much. Any thoughts?
Thanks,
-spencer
On Thu, Mar 03, 2005 at 06:58:08PM +0100, Karsten Wiese wrote:
Am Donnerstag 03 M?rz 2005 16:32 schrieb Spencer
Russell:
also on 2.6.11 you'd disable apm & acpi like above to try to get rid
of those random lockups or "Sequence Error!"s.
On Thu, Mar 03, 2005 at 12:41:17PM +0100, Karsten
Wiese wrote:
try with apm and acpi disabled.
append "apm=off acpi=off" to the kernels boot parameter line.
on laptops lots of things happen "beghind the scenes" .
"apm=off acpi=off" made a big differenc here when I used 2.4 kernels.
can you check if this error doesn't happen, when modprobing like
$ modprobe snd_usb_usx2y nrpacks=4
?
nrpacks=1 and "rawusb mode" are irrelevant if you run jack with moderate
latencies
as above "-p1024 -n2" and 2 inputs.
With nrpacks=4, it seems to last slightly longer before giving
the "Sequence Error!" and "Most propably some urb of usb-frame
935 is still missing"
What
kernel are you using? If its not 2.6.11 you might give that a try.
Every time I've tried using a 2.6 kernel on this machine, I get
these random lockups that I can't figure out, so I'm using 2.4.26
with lowlatency, preempt, and givecap patches. I'll try 2.6.11,
and see how that goes.
Rui said a while ago that he was getting a similar message, until
he tuned the IRQ priorities, but I've been googling around and I
can't figure out how to do it. I tried
chrt -f -p 90 'pidof "IRQ 0"'
as directed on some website, but it just returns
execvp: No such file or directory
failed to execute pidof "IRQ 0"
this is for the realtime kernel patches by Ingo Molnar.
I may be wrong, but I'd suggest you get it running on 2.6.11 before you
proceed with the realtime kernels.
Plain 2.6.11 gives me better low latency (and better behavior with acpi enabled too)
than
patched 2.4 kernels. lots of Ingo's enhancements are in 2.6.11 already.
Still the very basic mode with
$ modprobe snd_usb_usx2y nrpacks=4
must work flawlessly with 2 in / 2 out jack like
$ jackd -R -dalsa -dhw:0
on a plain kernel as first step.
srussell@slingshot:~$ lsusb
Bus 001 Device 001: ID 0000:0000
Bus 001 Device 002: ID 07a6:0986 ADMtek, Inc. AN986 Pegasus Ethernet
Bus 001 Device 005: ID 1604:8001 Tascam US-428 Audio/Midi Controller
Your ethernet is also on usb!
Usb audio is enough to fully occupy an USB 1.1 bus.
Try with us428 as the only usb client (without that usb ethernet).
cheers
Karsten