Natty and the Real Time Kernel

bart deruyter bart.deruyter at
Sat May 7 06:05:16 UTC 2011

Hi all,

I've got the same result as Brian David. The generic kernel works quite
well, but has xruns, strangely enough, mostly when doing 'nothing'. So far I
had no xruns because of recording, mixing, using rakarrack etc... The xruns
seem to happen at random.

I do use Unity though, maybe there is something in there that asks some
processes which cause the xruns.

My soundcard is an external one, Audiofire 12. jackd is setup at 48000, 256
frames/period and 3 periods/buffer, at a latency of 16 msec.

Running the low-latency kernel eliminates all xruns... I'll definatly keep
using it, and I do recommend it too.

2011/5/7 Brian David <beejunk at>

> On Thu, May 5, 2011 at 3:46 AM, Victor henri <nadaeck at> wrote:
> >
> > My personal experience is, since 2.6.33, many improvements have been done
> in
> > the low latency kernel; I, as several other people, have reported
> excellent
> > performances of the 2.6.37 and 2.6.38 low latency kernel, that seemed to
> get
> > much closer closer to the rt performance then before. That allows me,
> most
> > of the time to not use anymore the RT kernel and all its related
> problems...
> >
> I just installed Natty for the first time tonight.  This time around,
> I went with Xubuntu and installed the Ubuntu Studio packages on top of
> that.  As Scott mentioned, I needed to add myself to the audio group,
> but after this my equipment immediately worked.  Unlike previous
> versions, there was no need to change any configuration files to get
> access to my firewire device, which means that Ubuntu Studio is
> basically working out of the box for me now (or, it would be if I had
> installed from an Ubuntu Studio disc).  Yay!
> For a test run, I did some mixing on a recording I'm working on right
> now.  I started out using the generic kernel, and performance was
> surprisingly solid.  There were a few x-runs when starting up or
> switching between applications, but otherwise it was usable.
> I then installed Allessio's low latency kernel, and proceeded to mix
> for an hour and half without a single x-run, even when starting up
> applications and switching between them.  Rock on!  So, I can say
> definitively that the low latency kernel gives me better performance
> over generic.
> This test was run at 44.1 khz / 512 frames / 3 periods - getting about
> 34.9 msec latency.  The next time I get the chance, I'll set up some
> mics and do a recording test at lower latencies (I'll push it to 128
> frames, which will take it down to 8.71 msec latency.  This is
> something I have been able to do previously using rt kernels) and see
> how it performs.
> So far so good.  Thanks for the work, everyone!
> --
> -Brian David
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