On Sun, 8 Dec 2002, Paul Davis wrote: > you also haven't addressed kernel scheduling issues; the context > switch doesn't happen till the kernel has decided what task is going > to run next. if it picks the wrong one, for whatever reason, then > you/we lose. right now, it picks the wrong one too often, even with > SCHED_FIFO+mlockall.
Btw; have you tried the O(1) scheduler? It has a number of interesting charasteristics from an audio app developer's pov [1]: - RT-scheduling is, too, O(1) (less cache use, quicker context switches...) - RT-scheduling is separated from non-RT scheduling - perfect SMP-scalability (no shared run-queue lock) And of course, as O(1) is under active development (in 2.5, in 2.4-ac and patches for latest 2.4 kernels), a possible bug in SCHED_FIFO semantics might receive kernel-hacker interest. ;) Do you have any simple test cases to reproduce the problem... only with ardour+jackd or perhaps also simpler setups like jackd+capture_client or some such? [1] http://www.uwsg.iu.edu/hypermail/linux/kernel/0201.0/0810.html -- http://www.eca.cx Audio software for Linux!
