[LAU] 3.8 vs. 3.5 for realtime USB performance
jamesmstone at gmail.com
Fri Jun 28 21:02:15 UTC 2013
On Fri, Jun 28, 2013 at 7:49 PM, Fernando Lopez-Lezcano <
nando at ccrma.stanford.edu> wrote:
> On 06/28/2013 10:23 AM, Fernando Lopez-Lezcano wrote:
>> 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:
>>> Hi Clemens (and everyone else),
>>> This didn't fix the bug. See:
>>> 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:
>> It seems that it fixes the problem.
> I can get 128x3 with no problems or glitches on an VSL181 USB2 interface.
> Anything 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.
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