> > And what else is happening on the system at the time? > > The original poster would have to anwer that. Jack itsself is just messing > with SYSV SHM and occasioanly touching fifos. I can't talk for the original poster, but on my system I was just running windowmaker, qjackctl (a gui to start jack with settings of full duplex and a period of 512 on a SBLive) and hydrogen (a drum machine running through jack). I was getting xruns when putting the system under some stress (switching workspaces opening windows or new programs and switching between windows). 2.4.23 with your low latency patch doesn't show this behaviour. James
