On Sun, 2005-09-11 at 05:11 +0200, Michael Rudolf wrote:
  Another point is shared memory; I have that enabled in
the kernel, I
 have a
 tmpfs mounted on /dev/shm, and Jack is compiled with support ("JACK
 compiled with System V SHM support."), but I have read that Jack
 uses /tmp
 for pipes per default, and I can in fact see some
 in /tmp/jack-[uid]/default/. Now /tmp is a normal ext3 file system
 here,
 not a tmpfs. Could that alone be the problem?  
Yes, that is almost certainly the problem.
The /tmp entry in /etc/fstab should look like this:
tmpfs           /tmp            tmpfs   defaults                0       0
Any decent distro should do this by default.
Lee