> Hello! > >> I'm re-styling the demudi tasks packages, which I'd like to upload to >> Debian in the near future. One of them it's called demudi-config and >> it's haevily based on the debian-edu-config package. It uses cfengine >> to customize configuration files in a consistent manner. >> >> As already discussed, we are going to drop the demudi specific version >> of the jack package, and rely on the debian one. >> >> I was wandering about which tunings are needed to the enhance the >> performance of jackd, and whether they should be accomplished through >> the demudi-config task or directly with jackd. >> >> The ones that come to my mind are: >> >> 1) Turn on low latency: >> >> echo 1 > /proc/sys/kernel/lowlatency > > using /etc/sysctl.conf is nicer than this. > Perfect, thank for the hint.
>> This assumes a patched 2.4 kernel, which AFAIK is not the case of >> the official Debian kernel. > > True. Are you going to upload the DeMuDi Kernel to Debian? > Yes I'd be glad to do it, but I'm not sure whether once I become a Debian maintaner I'm allowed to upload kernel-image packages.. >> I don't know whether the 2.6 series need such tuning too.. > > There are now lowlatency patches (in this form) for 2.6. There is > PREEMPT and in the ck-patches there is a very interesting isochronous > scheduling mode. > Ok. Shall we start writing a list of all the patches we apply over the standard 2.6 kernel source package? >> 2) Setuid the jackstart binary. This can be accomplished via >> dpkg-statoverride (as suggested in the README.Debian of jackd), but >> I'm not sure whether the best solution is: > > Why don't you all subscribe to the jack-audio-connection-kit package on > <http://packages.qa.debian.org/j/jack-audio-connection-kit.html>? > Sure, I just did it. > JACK (>= 0.94.0-2) does contain jackstart setuid root, executable by > group audio. > > dpkg-statoverride is only if you want to _override_ permissions. > Sorry I really didn't notice this. Well done! :) รน>> >> 3) Mount /tmp as a tmpfs, adding the line >> >> none /tmp tmpfs defaults 0 0 >> >> to fstab. Again this can be accomplished both inside demudi-config >> and inside jackd and I'm not sure which place is better. > > Also done. libc6 >= something-ds11 mounts a shmfs onto /dev/shm. JACK > (>= 0.94.0-2) puts its files there. > Really great. >> 4) Write a ~/.asoundrc file (for users in the audio group). I don't >> know if this is really necessary, but it can be accomplished by >> demudi-config. > > No. I don't think it's necessary. jackd defaults to hw:0, which makes > sense. > Ok so let's drop it. Free
