On Fri, Jun 28, 2013 at 7:49 PM, Fernando Lopez-Lezcano <span dir="ltr"><<a href="mailto:nando@ccrma.stanford.edu" target="_blank">nando@ccrma.stanford.edu</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb"><div class="h5">On 06/28/2013 10:23 AM, Fernando Lopez-Lezcano wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 06/27/2013 04:24 PM, James Stone wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
<br>
On Sun, Jun 9, 2013 at 10:04 AM, Clemens Ladisch <<a href="mailto:clemens@ladisch.de" target="_blank">clemens@ladisch.de</a><br>
<mailto:<a href="mailto:clemens@ladisch.de" target="_blank">clemens@ladisch.de</a>>> wrote:<br>
<br>
James Stone wrote:<br>
> I am struggling to get usable realtime performance <512 latency<br>
on my<br>
> Ubuntu Studio "low latency" kernels 3.8... The 3.5 kernel in<br>
contrast works<br>
> fine. I put a bugreport in with Ubuntu, but it seems like no-one<br>
else is<br>
> reporting the same problem. Makes me wonder if I am doing<br>
something wrong.<br>
> Is there anything additional I should be trying, or is this a<br>
known problem<br>
> that is being worked on by the kernel devs?<br>
<br>
You have to wait for the next stable kernel:<br>
<<a href="http://git.kernel.org/linus/e194401783" target="_blank">http://git.kernel.org/linus/<u></u>e194401783</a>><br>
<br>
Hi Clemens (and everyone else),<br>
<br>
This didn't fix the bug. See:<br>
<br>
<a href="https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1191603" target="_blank">https://bugs.launchpad.net/<u></u>ubuntu/+source/linux/+bug/<u></u>1191603</a><br>
<br>
and:<br>
<br>
<a href="https://bugs.launchpad.net/ubuntu/+source/linux-lowlatency/+bug/1185563" target="_blank">https://bugs.launchpad.net/<u></u>ubuntu/+source/linux-<u></u>lowlatency/+bug/1185563</a><br>
<br>
Do you have any thoughts? Is this a problem with alsa/jack (as seems to<br>
be being implied) or with the kernel?<br>
</blockquote>
<br>
I'm building a kernel with the fix that's here:<br>
<a href="https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1136110" target="_blank">https://bugs.launchpad.net/<u></u>ubuntu/+source/linux/+bug/<u></u>1136110</a><br>
It seems that it fixes the problem.<br>
</blockquote>
<br></div></div>
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).<span class="HOEnZb"><font color="#888888"><br>
<br>
-- Fernando<br>
</font></span></blockquote></div><br><br>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.<br><br>James<br>