Hi all tonight here in France,
I've finished my tests on my netbook.
So with last low-latency kernel coming from Alessio PPA, i can run jackd
+ hydrogen + ardour at 11,4ms, 256 frames /3 periods with an small intel
onboard sound card on my modest netbook asus eeepc celeron 900 MHz, 2Go
with natty and unity desktop without any xruns. I'm using 17% of Jackd
RT power.
on the generic kernel, i've got many xruns as soon as i'm moving a
window of any program...
Compare to lucid RT kernel running under the same computer, the level of
performance is quite the same and low-latency kernel could be use for
production.
An another info, the graphic controller is an old onboard intel i810.
Complete demo and official conference about multimedia with
ubuntu/ubuntu studio in Paris next saturday in La Villette sciences city
if the island volcanoe let me fly to Paris ;-)
Some news coming soon.
Bye
Laurent
Le 07/05/2011 08:05, bart deruyter a écrit :
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.
http://www.bartart3d.be/
2011/5/7 Brian David <beej...@gmail.com <mailto:beej...@gmail.com>>
On Thu, May 5, 2011 at 3:46 AM, Victor henri <nada...@hotmail.com
<mailto:nada...@hotmail.com>> 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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