[LAU] ubuntu 9.10 RT and Jack

david gnome at hawaii.rr.com
Tue Nov 17 02:33:29 EST 2009


Folderol wrote:
> On Mon, 16 Nov 2009 15:39:11 -0600
> Gary Morgan <gmorgan777 at gmail.com> wrote:
> 
>> I've asked about this on the ubuntu forums to little avail...just wondering
>> what you guys might think. Far from a professor of linux audio, but I'm
>> getting more and more into it.
>>
>> I've built a couple basic machines from scratch recently, amd dual cores w/
>> 2gb of memory. Not wanting to spend the extra dough on a nice sound card +
>> interface yet, I settle with just using chipset sound. The 9.10 and 9.04
>> vanilla kernels have worked for me pretty well using Jack, but if I whenever
>> I try to get the RT working, all kinds of problems show up: insane amounts
>> of Xruns just as Jack starts up, Ardour can't connect, and processor ends up
>> using half its resources to stay running. Needless to say, recording is not
>> really possible.
>>
>> This is after tweaking memlocks, nice %s , buffers and so on.
>>
>> I know that chipset sound, is not a very efficient recording interface, but
>> it seems there is more going on, besides that.
>>
>> I have two main questions here (they sum up to: how much of this is the
>> chipset?)
>> a. i had heard here and there in forums that the RT kernel in 9.04 and on
>> was 'broken'. is that true?
>>
>> b. Is RT only worth using for higher end machines with more ram and separate
>> sound cards?
>>
>> And one more: Would anyone recommend using a different audio OS for this
>> situation, like 64 studio? (i might have mentioned jacklab, but it seems
>> that project has been killed)
>>
>> Im hoping someone can help settle my curiosity here......
> 
> Try 64studio 3(beta). This works very well for me on a dual core
> athlon. However, I do also have a 2496 sound card. Personally, I've not
> found any of the plain ubuntu offerings stable enough. 
> 
> Incidentally, it looks like we may end up going straight from there to
> 4 actually :o

Maybe try jackdmp AKA Jack2? I've heard jackd (non-mp) might not find 
dual-processor machines cooperative all the time?

-- 
David
gnome at hawaii.rr.com
authenticity, honesty, community



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