Hi all, 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 This assumes a patched 2.4 kernel, which AFAIK is not the case of the official Debian kernel. I don't know whether the 2.6 series need such tuning too.. 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: a. Add debconf support to the jackd package and ask a question, for example "Do you want jackstart setuid?", if the the answer is positive the postinst script takes care of running dpkg-statoverride. In this case the demudi-config package would just inject the appropriate value in the debconf database. b. Do a. but through the demudi-config package, maybe without the question, as we assume a positive answer. c. Do not setuid the jackstart binary, but rather prepare a 2.6 kernel for DeMuDi (I'm assuming that Debian is not going to adopt such patch in the short term), using the Jack O'Quin's kernel module. The demudi-config package could make sure that such module is loaded in the correct way and ask which users should belong to the audio group. 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. 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. Nothing more comes to my mind by now.. Cheers, Free
