Re: [LAU] 3.8 vs. 3.5 for realtime USB performance

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To: Fernando Lopez-Lezcano <nando@...>
Cc: <linux-audio-user@...>, Clemens Ladisch <clemens@...>
Date: Friday, June 28, 2013 - 9:02 pm

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On Fri, Jun 28, 2013 at 7:49 PM, Fernando Lopez-Lezcano <
nando@ccrma.stanford.edu> wrote:

> On 06/28/2013 10:23 AM, Fernando Lopez-Lezcano wrote:

Hmm.. not tried that patch, but I tried the reverted kernel - which is the
fix they are pushing for that bug, and it doesn't help.

James

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On Fri, Jun 28, 2013 at 7:49 PM, Fernando Lopez-Lezcano &=
lt;nando@ccrm=
a.stanford.edu
> wrote:
On 06/28/2013 10:23 AM, Fernando Lo=
pez-Lezcano wrote:

On 06/27/2013 04:24 PM, James Stone wrote:

On Sun, Jun 9, 2013 at 10:04 AM, Clemens Ladisch <clemens@ladisch.de
<mailto:clemens@=
ladisch.de
>> wrote:

=C2=A0 =C2=A0 James Stone wrote:
=C2=A0 =C2=A0 > I am struggling to get usable realtime performance <5=
12 latency
on my
=C2=A0 =C2=A0 > Ubuntu Studio "low latency" kernels 3.8... The=
3.5 kernel in
contrast works
=C2=A0 =C2=A0 > fine. I put a bugreport in with Ubuntu, but it seems lik=
e no-one
else is
=C2=A0 =C2=A0 > reporting the same problem. Makes me wonder if I am doin=
g
something wrong.
=C2=A0 =C2=A0 > Is there anything additional I should be trying, or is t=
his a
known problem
=C2=A0 =C2=A0 > that is being worked on by the kernel devs?

=C2=A0 =C2=A0 You have to wait for the next stable kernel:
=C2=A0 =C2=A0 <http://git.kernel.org/linus/e194401783>

Hi Clemens (and everyone else),

This didn't fix the bug. See:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug=
/1191603

and:

https://bugs.launchpad.net/ubuntu/+source=
/linux-lowlatency/+bug/1185563

Do you have any thoughts? Is this a problem with alsa/jack (as seems to
be being implied) or with the kernel?

I'm building a kernel with the fix that's here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug=
/1136110

It seems that it fixes the problem.

I can get 128x3 with no problems or glitches on an VSL181 USB2 interface. A=
nything lower does not work but this is perfectly usable (in a short test).=

-- Fernando
Hmm.. not tried that patch, but I =
tried the reverted kernel - which is the fix they are pushing for that bug,=
and it doesn't help.James

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Messages in current thread:
[LAU] 3.8 vs. 3.5 for realtime USB performance, James Stone, (Sat Jun 8, 7:49 pm)
Re: [LAU] 3.8 vs. 3.5 for realtime USB performance, Clemens Ladisch, (Sun Jun 9, 9:04 am)
Re: [LAU] 3.8 vs. 3.5 for realtime USB performance, James Stone, (Thu Jun 27, 11:25 pm)
Re: [LAU] 3.8 vs. 3.5 for realtime USB performance, Fernando Lopez-Lezcano, (Fri Jun 28, 5:23 pm)
Re: [LAU] 3.8 vs. 3.5 for realtime USB performance, Fernando Lopez-Lezcano, (Fri Jun 28, 6:50 pm)
Re: [LAU] 3.8 vs. 3.5 for realtime USB performance, James Stone, (Fri Jun 28, 9:02 pm)
Re: [LAU] 3.8 vs. 3.5 for realtime USB performance, James Stone, (Sun Jun 9, 10:25 am)