On Thu, Feb 26, 2009 at 06:21:48PM -0500, Paul Davis wrote: > On Thu, Feb 26, 2009 at 4:20 PM, tizo <tizone@xxxxxxxxx> wrote: > > > Hi there, > > > > Sorry about my previous mail. I was just starting to write a draft > > about the topics I want to ask, and I accidentally push the send > > button. > > > > Well, my goal is to play two midi keyboards, sending the events > > through jackd, to qsynth. My computer is a Laptop HP 550, with HDA > > Intel sound card, 3 GB of memory, and a Core 2 DUO CPU of 1.40 GHz. My > > OS is UbuntuStudio 8.04, with kernel 2.6.24-23-rt. > > > > First of all, I cannot run jackd without xruns, if I configure it with > > 32 frames per period, or less. I am running it as root, with realtime, > > and a priority of 70. As soon as I run it, it starts to count xruns, > > and I am only executing jackd. > > > 32 frames per interrupt is VERY ambitious with an Intel HDA chipset. Its not > impossible but every single part of your system has to be "just right" for > this to work. I would start with a less ambitious goal first, and get some > experience with the setup before trying to get all the way to this latency > level. > > moving to USB will likely make things worse. latencies like this are best > accomplished with good, prosumer level PCI audio interfaces. and most certainly not with a kernel that old. the old hda drivers are totally broken. a quick test on vanilla 2.6.28 shows it runs at -p32 -n3. but it gives me some xruns when i switch desktop. -n2 is not possible. i get xrun streams. -- torben Hohn http://galan.sourceforge.net -- The graphical Audio language _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
