Re: [microsound] DeMuDi (Linux distro)

[derek holzer <derek@xxxxxxx>]

Hi Tad,

vze26m98@xxxxxxxxxxxxx wrote:

>>6) Recompile recent 2.4 or 2.6 kernel from just about any Linux
>>distro for low-latency
>
> Pointers/links to  follow on this subject?  Where are the patches 
archived?

Most kernels beyond 2.4.18 or so have an option in the kernel config to 
enable low latency, and most have also preemptive option. For the 
bleeding edge (as in I take no liability for possible damages 
caused...), lots of linux audio folks have been using a 2.6.10 kernel 
with Andrew Morton's patchset and Ingo Molnar's RealTime patch.

Details on the 2.6.10-rc2-mm3-RT kernel/patch combo can be found in 
kerneltrap.org's achives:

http://kerneltrap.org/mailarchive/1/message/533/thread?PHPSE
SSID=19e5bf1c78099fadb616b0a2936d58d4

or

http://tinyurl.com/67ufy

Also look out for the Capabilities and Linux Security Module 
(realtime-LSM) patches for your kernel, which allow for non-root users 
to safely schedule realtime processes [such as running JACK]. Have a 
look at the "installing the kernel" section of the very clear Planet 
CCRMA docs for a bit more explaination of how LSM works:

http://ccrma.stanford.edu/planetccrma/software/

Please note that this is not newbie stuff, but requires pretty good 
knowledge of kernel-compilation to use. If you're not up to that, you 
might stick with Planet CCRMA or Demudi's kernels, which try to 
incorporate much of these developments.

PlanetCCRMA tends to have more recent kernels, but RedHat/Fedora is a 
very bloated distro, with lots of stuff you don't need for audio slowing 
your system down substantially. Debian/Demudi tends to be cleaner, or at 
least easier to optimize, but more "conservative" in terms of the 
newness of software. With Ubuntu, you get what's on the box: dumbed-down 
Debian with a push-button installer which is great for noobs but not as 
optimized as Demudi.

For more info, I'd recommend checking the following lists out:

Linux-Audio-User
PlanetCCRMA
Demudi

I really gotta find time to stick all this on the WIKKI! ;-)

derek

--
derek holzer ::: http://www.umatic.nl
---Oblique Strategy # 142:
"Shut the door and listen from outside"

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