Hi, I have installed Ubuntu 10.04 LTS, plus some ubuntu studio stuff (the audio packages and the plugins). I also tried the rt-kernel. It didn't work. But i am amazed, blown away, baffled, etc. Because the generic kernel does have some crazy rt capabilities indeed. I guess the ubuntu studio packages must have created the audio group and jack must have written the proper things in the limit file, but still, it works surprisingly well. Jack can run in rt with a latency as low 4 ms without any xruns, although it crashes.It works just fine at 5.33 ms. Even pd itself work with an extremely low latency (I'd say below 7 ms), I'm assuming that's because it was configured to run in rt during the install. I don't even know if i need JACK anymore. Does any of you know how i can measure the actual latency in Pd? I couldn't tell by ear which config was faster, Pd alone or Pd plus JACK. Looks like it time to say goodbye to rt-kernels...
This makes me happy.
Cheers!
Pierre
2010/11/15 András Murányi muranyia@gmail.com
So, running the aforementioned RT kernel, managed to patch the latest nvidia driver following these general instructions: http://ubuntuforums.org/showpost.php?p=9233282&postcount=5 I'm already happy because it's quite some time that i haven't had the RT kernel!
As i don't use GEM i cannot tell about it, but Pd got faster. Almost as fast as the 32-bit Pd was (on 64-bit Ubuntu - Hardy that time). It means i can almost use my MIDI sequencer patch without the GUI dropping out. Promising! Now i can dig into the patch for optimisation possibilities, and at the same time, keep on bugging the community for speeding up the GUI :o)
Do you guys think i shall try it with a current 32-bit Pd to see if the 64-bit version is really slower...?
(on a side note to RT kernel experiences: the CPU got hotter indeed, looks like i'll have to tweak the cooling fans again...)
Andras
On Mon, Nov 15, 2010 at 9:27 AM, cyrille henry ch@chnry.net wrote:
hello, 195.36.24 is the nvidia driver version i'm using. mainly because it's the version shiped with ubuntu 10.04. i don't know what 260 would offer better, but i think it's not impressive. most of nvidia upgrade is adding support for new card. anyway, if you don't use graphics for any important stuff, then you probably don't care.
i'll be interested to know your impression if you try this kernel for pd/Gem.
Cyrille
Le 14/11/2010 18:02, András Murányi a écrit :
i'm using Ubuntu Lucid with standard kernel (64-bit), and performance in Pd hasn't really impressed me lately... and WHOA i've just found a PPA with RT kernel (https://launchpad.net/~abogani/+archive/ppa/https://launchpad.net/%7Eabogani/+archive/ppa/), which i'm very interested in - it's just that it comes with older Nvidia drivers 195.36.24 while the latest drivers from Nvidia are 260.19.21. Now does anyone know if i'll loose anything important with this older (but appropriately patched for RT) graphics driver? (btw i don't use graphics for anything important...)
Andras
On Sun, Nov 14, 2010 at 3:25 PM, cyrille henry <ch@chnry.net mailto:ch@chnry.net> wrote:
hello,
you say that you need a RT kernel : did you benchmarck the difference between a RT kernel and a standard kernel?
anyway, i'm using ubuntu 10.04 with no optimisation. compiling pd/Gem is very fast and easy, so i don't wait the official package...
cyrille
Le 14/11/2010 13:48, Pierre Massat a écrit :
Hi all! I have realized lately that Fedora/PlanetCCRMA may not be the best linux rt distro out there in terms of updates for Pd. So I wanted to conduct a survey among pd-list members to know who is using what. It seems like Ubuntu Studio is the distro that's most frequently updated. Toobed because the last time i tried to install it on my laptop it didn't work... Any advice would be appreciated. I need a rt kernel, of course...
Pierre
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