On Friday 27 January 2006 23:20, Jon Hoskins was like: > Hey all, thought I would share some of my recent discoveries: > > As demudi 1.2.1 has been lacking a kernel source for awhile It does? Are you sure? > and demudi > 1.30rc1 refuses to boot on my new hardware I've had to seek alternatives. > > After reading several threads on using Ubuntu as a music production OS I > decided to give Ubuntu 5.10 'breezy' a shot. Installing "realtime-lsm" > with module-assistant was easy as pie and I got relatively good latency > with the stock kernel, but real improvements came from two things: > > I decided to give Ubuntu 6.04 "Dapper Flight 3" a run and noticed that > #cat /boot/config-2.6.15-4-386 | grep PREEMPT gives CONFIG_PREEMPT=y and > has been the same in all the "dapper" kernels I've tried, something that > was not enabled in the stable "breezy" kernels. Does this mean the ubuntu > guys are looking at releasing a stable kernel with PREEMPT enabled? It does look rather like they they may be from what you say. !:) > Anyway the second thing I found was using 'rtlimits' instead of > "realtime-lsm". Making use of a small app I found at: > http://www.physics.adelaide.edu.au/~jwoithe/ > > makes assigning realtime access on an app-per-app basis and even > user/group basis a breeze. This combination has lowered my latency *under > load* to 5.8ms in KDE (Kubuntu is what I installed) and I can squeeze > 2.9ms out of it in a very conservative fluxbox or even xfce4 enviroment > with no xruns and less than 10% cpu/dps usage (as reported by qjackctl). > Most of the good sound apps are available in the repositories as well with > the exceptions of Seq24 (conflicting libs) that I easily built from > scratch, Freecycle, which I'm still trying to get to compile correctly, > and Willem's wonderful DSSI packages. > > It looks like Ubuntu might have a stable release on the horizon suitable > for serious audio work! You are more than welcome to check my blog as > well for an up-to-date journal of my ubuntu "studio" experiments and > installed software list: http://oktyabr.blogspot.com Jon, thank you. I've been waiting for someone to report success with Audio on Ubuntu. Hopefully, recent moves to make sure A/DeMuDi releases enter the main Debian repositories in a timely fashion, will help bring all Debian based multimedia systems into focus and increase compatibility between the systems as well as ensuring that sources are always easily available. -- cheers, tim hall http://glastonburymusic.org.uk/tim
