<br><br><div class="gmail_quote">On Thu, Feb 26, 2009 at 4:20 PM, tizo <span dir="ltr"><<a href="mailto:tizone@gmail.com">tizone@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi there,<br>
<br>
Sorry about my previous mail. I was just starting to write a draft<br>
about the topics I want to ask, and I accidentally push the send<br>
button.<br>
<br>
Well, my goal is to play two midi keyboards, sending the events<br>
through jackd, to qsynth. My computer is a Laptop HP 550, with HDA<br>
Intel sound card, 3 GB of memory, and a Core 2 DUO CPU of 1.40 GHz. My<br>
OS is UbuntuStudio 8.04, with kernel 2.6.24-23-rt.<br>
<br>
First of all, I cannot run jackd without xruns, if I configure it with<br>
32 frames per period, or less. I am running it as root, with realtime,<br>
and a priority of 70. As soon as I run it, it starts to count xruns,<br>
and I am only executing jackd.</blockquote><div><br>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.<br>
<br>moving to USB will likely make things worse. latencies like this are best accomplished with good, prosumer level PCI audio interfaces.<br><br>--p<br> <br></div></div><br>