Back on Sunday 10 April 2005 03:25 pm, Aaron Trumm was like: > hello all - got a question - I've only recently been stopping and taking a > look at my studio computer's performance and in the almost year since I > change from Red Hat 9 to gentoo, it's been more solid on some things, but I > notice a huge latency difference - ie: I have to run Jack at -p 8192 to get > anything done in Ardour > > Anybody have any tips on what to look at to tweak it? Seems like it should > do better than that... I didn't see it as a problem until in the last few > days I started playing with playing softsynths live directly into Ardour - > you've gotta be running at -p 1024 or there's a latency that screws up your > playing - at 8192 it's a downright 8th note delay... > 1: update kernel to at least 2.6.11 2: make sure the jack tmpdir is set to a ramdrive (tmpfs) 3: try building jack from cvs (there's been MANY improvements) As a side note, you can patch gentoo-sources with Ingo's realtime-preempt patchset. I've done it and the only failed patches was one to modify the kernel tag (pointless and not needed) and a trivial one the fails if you have gentoo's custom bootsplash framebuffer (Nothing significant. It just adds brackets into an if statement) That patch will speed up the latency quite a bit. Use it with caution though because you will trade off speed for stability. You can also muck around with the kernel's compiler flags in /usr/src/linux/arch/i386/Makefile but again, you'll be playing with fire. -Reuben
