[linux-audio-dev] Re: Low Latency Kernel Combos

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Subject: [linux-audio-dev] Re: Low Latency Kernel Combos
From: Josh Green (jgreen_AT_users.sourceforge.net)
Date: Fri Jun 01 2001 - 12:05:44 EEST


I finally found a satisfactory Linux lowlatency kernel combo. I was able
to make a patch for Linux 2.4.5 from Andrew Mortin's lowlatency patch
for Linux 2.4.4 (to be honest I really didn't have to do that much :).
This patch is now on his site:
http://www.uow.edu.au/~andrewm/linux/schedlat.html

I posted results of Benno's latencytest program on my machine with and
without the lowlatency stuff enabled
(http://www.gardena.net/benno/linux/audio/) at the following site:
http://www.resonance.org/~josh/lowlat/

I'm pretty impressed with how the Linux kernel is performing without the
lowlatency patch. It appears that probably a good portion of the low
latency work being done has been incorporated into the official source.
Good to know :) And of course I'm really impressed with the lowlatency
patch enabled! 3.8 ms max latency with tons of disk access, etc! WOW! I
think that is probably pretty good :) Something I'm fairly curious about
is how non SCHED_FIFO programs are affected by all this low latency
work. Do any programs that want to take advantage of low latency have to
be run as root to modify scheduling etc. If anybody wants to enlighten
me on this I would appreciate it. Lates..
        Josh Green


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