As I learn more about this issue I am realizing the biggest thing affecting pro audio work on Ubuntu is the system timer resolution. Not only does it cause this error in Rosegarden it cause audio latency issues under jackd.
With a stock Ubuntu 2.6.15 kernel with the system timer resolution changed to 1000 hz and a recompile my system will reliably do 128 frames buffer (5 msecs latencies) with 0 buffer over runs or under runs in jackd. Whereas with the current stock kernel at 250 hz system timer I would get under runs and over runs all the way up to 22 msecs latencies. This is starting to look like a big issue to me. I personally spent a month tweaking my Ubuntu system for audio work. And now it appears to me this one kernel setting was the real culprit. Right now a noob to Ubuntu pro audio is directed to recompile the kernel straight off. This is not really ideal at all. At the very least couldn't there be an 1000 hz timer kernel option in the repositories? Then at the ubuntustudio.com wiki we could point new users to try this kernel first before recompiling from scratch and going full RT with Ingo's patch? -- Kernel timer resolution too low https://launchpad.net/bugs/53365 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
