[LAU] Re: Installing realtime kernel - getting it to work.

Brad Fuller escribe: It's "preemptive kernel" and "realtime" which are different stuff. AFAIK you can try going realtime without a preemptive kernel (this is, a kernel without Ingo Molnar patches). Going preemptive: Download a vanilla kernel sources, version according to latest available Ingo Molnar patches. Apply patches, recompile, install, reboot. [1]This article explains nicely what preemption is all about. 1. http://lwn.net/Articles/146861/ If running a debianized distro things are far easier, simply download a [2]Musix kernel or a [3]64 Studio kernel (I'm right now running Debian sid with a Musix 2.6.20 kernel and everything's smooth). 2. http://linux.ilmainen.net/musix/ 3. http://archive.64studio.com/64studio/testing/pool/main/l/linux-2.6/ Talking about realtime, the newest the kernel the better although other things break. Going realtime is a matter of running a fairly recent version of libpam-modules (higher than 0.79 I think), making sure the user is a member of the audio group, putting this stanza into /etc/security/limits.conf and relogging. # limit realtime and memory locking access to users in the group audio # there is no way to say "allow locking all memory", 4G should be enough # * - rt_priority 0 * - nice 0 # @audio - rtprio 99 @audio - memlock 250000 @audio - nice -10 You should then be able to run jackd realtime. : [ ~ ] $; jackd -R -d alsa Also it should be useful enabling the high resolution timer in your /etc/sysctl.conf as this: dev.rtc.max-user-freq=1024 And then sysctl -p as root. Hope I haven't mistaked anything and info is useful. Cordially, Ismael -- Ismael Valladolid Torres m. +34679156321 La media hostia j. ivalladt(a)gmail.com http://lamediahostia.blogspot.com/