[LAU] 3.8 vs. 3.5 for realtime USB performance

Fernando Lopez-Lezcano nando at ccrma.Stanford.EDU
Fri Jun 28 17:23:08 UTC 2013


On 06/27/2013 04:24 PM, James Stone wrote:
>
>
> On Sun, Jun 9, 2013 at 10:04 AM, Clemens Ladisch <clemens at ladisch.de
> <mailto:clemens at ladisch.de>> wrote:
>
>     James Stone wrote:
>     > I am struggling to get usable realtime performance <512 latency on my
>     > Ubuntu Studio "low latency" kernels 3.8... The 3.5 kernel in contrast works
>     > fine. I put a bugreport in with Ubuntu, but it seems like no-one else is
>     > reporting the same problem. Makes me wonder if I am doing something wrong.
>     > Is there anything additional I should be trying, or is this a known problem
>     > that is being worked on by the kernel devs?
>
>     You have to wait for the next stable kernel:
>     <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.

-- Fernando


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