On Fri, Feb 27, 2009 at 1:11 PM, tizo <tizone@xxxxxxxxx> wrote:> On Fri, Feb 27, 2009 at 12:36 AM, <torbenh@xxxxxx> wrote:>> 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.>>>> I have tried UbuntuStudio 8.10; I can't remember nor the version of> the kernel, neither the jack performance, but that kernel had a> reported bug, that broke the usb connections with midi keyboards.>> Maybe I will try another distribution and/or kernel, but that bug has> to be fixed for me to be useful.>> I am running jackd with -n3 too; as you said, with -n3 is not possible. I meant "with -n2 is not possible". >>>> -->> 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>>>> Thanks very much,>> tizo>_______________________________________________Linux-audio-user mailing listLinux-audio-user@xxxxxxxxxxxxxxxxxxxxxxxx://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
