From: derek holzer <derek@xxxxxxx>
Reply-To: microsound <microsound@xxxxxxxxxxxxx>
To: microsound <microsound@xxxxxxxxxxxxx>
Subject: Re: [microsound] DeMuDi (Linux distro)
Date: Wed, 16 Mar 2005 16:59:32 +0100
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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