Re: [LAD] snd-usb-audio dying on jackd xruns

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
To: Gabriel Beddingfield <gabrbedd@...>
Cc: <linux-audio-dev@...>
Date: Wednesday, February 2, 2011 - 11:40 pm

--90e6ba5bb8dbaf50a5049b552ceb
Content-Type: text/plain; charset=UTF-8

> Which kernel?

Ubuntu Linux 2.6.35-25-generic
http://packages.ubuntu.com/maverick-updates/linux-image-2.6.35-25-generi...

I've tried various kernels from 2.6.32 to 2.6.35 various Ubuntu and Debian
kernels. All experience the same. I have not yet compiled a kernel myself
since it's a lot of work and the performance gains are negligible. Since the
problem persists in all kernels I've tried it makes me suspect that the bug
is in the master tree not something that was added on in a distro kernel.

> Shooting from the hip (and also digging in 2.6.26.5 sources)... looks

That sounds consistent with my reports. It's speculation, but at least we
have that...

I bought two PCI USB cards to test against. One is PCI Express USB 3.0 the
other is PCI USB 2.0 - I'll report the results.

Assuming that the on-board hardware is being unusually slow - this ought to
fix it. If it's deeper in the core hardware I should probably scrap this
board and get something that works properly. Either way I ought to know
something soon. :-D

I'll add the USB cards tonight. Stay tuned! :-D

...Rods ;-)

--90e6ba5bb8dbaf50a5049b552ceb
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

Which kernel?Ubuntu Linux 2.6.35-25-generic

http://packages.ubuntu.com/maverick-updates/linux-image-2.6.3=
5-25-generic

I've tried various kernels from 2.6.32 to 2.6.35 va=
rious Ubuntu and Debian kernels. All experience the same.=C2=A0I have not y=
et compiled a kernel myself since it's a lot of work and the performanc=
e gains are=C2=A0negligible. Since the problem persists in all kernels I&#3=
9;ve tried it=C2=A0makes me suspect that the bug is in the master tree not =
something that was added on in a distro kernel.

=C2=A0
Shooting from the hip (and also digging in 2.6.26.5 sourc=
es)... looks
like there was a timeout when calling usb_set_interface()
(drivers/usb/core/message.c). =C2=A0The urb transfers look like they
stalled rather than failed to allocate bandwidth. =C2=A0That makes me think=

there's a bad cable, bad USB controller, bad USB controller /driver/,
bad format request, bad device, or something like that.That sounds consistent with my reports. It's speculati=
on, but at least we have that...=C2=A0

I bought two PCI USB cards to test against.=C2=A0One is PCI Express USB 3.0=
the other is PCI USB 2.0 - I'll report the results.Assuming that the on-board hardware is being unusually slow - this o=
ught to fix it.=C2=A0If it's deeper in the core hardware I should proba=
bly scrap this board and get something that works properly.=C2=A0Either way=
I ought to know something soon. :-D

I'll add the USB cards tonight. Stay tuned! :-D...Rods ;-)

--90e6ba5bb8dbaf50a5049b552ceb--

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:
[LAD] snd-usb-audio dying on jackd xruns, Rods Bobavich, (Wed Feb 2, 4:42 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Gabriel Beddingfield, (Wed Feb 2, 4:58 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Rods Bobavich, (Wed Feb 2, 5:24 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Clemens Ladisch, (Thu Feb 3, 8:21 am)
Re: [LAD] snd-usb-audio dying on jackd xruns, Rods Bobavich, (Thu Feb 3, 3:44 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Gabriel Beddingfield, (Wed Feb 2, 5:48 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Rods Bobavich, (Wed Feb 2, 6:01 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Arnold Krille, (Wed Feb 2, 7:00 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Gabriel Beddingfield, (Wed Feb 2, 6:07 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Rods Bobavich, (Wed Feb 2, 6:12 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Gabriel Beddingfield, (Wed Feb 2, 6:20 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Rods Bobavich, (Wed Feb 2, 6:42 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Gabriel Beddingfield, (Wed Feb 2, 6:53 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Rods Bobavich, (Wed Feb 2, 7:09 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Gabriel Beddingfield, (Wed Feb 2, 7:25 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Rods Bobavich, (Wed Feb 2, 11:40 pm)
Re: [LAD] snd-usb-audio dying on jackd xruns, Jeremy Jongepier, (Thu Feb 3, 9:51 am)
Re: [LAD] snd-usb-audio dying on jackd xruns, James Morris, (Thu Feb 3, 12:31 am)