[linux-audio-user] x86_64 and ingo's realtime patches, works?

Mark Knecht markknecht at gmail.com
Tue Jan 17 20:40:08 EST 2006

Hi Loki,
   I'm running exactly that kernel in 64-bit mode:

mark at lightning ~ $ uname -a
Linux lightning 2.6.15-rt2 #2 PREEMPT Thu Jan 5 16:13:25 PST 2006
x86_64 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux
mark at lightning ~ $

It works OK for me. I'm xrun free at 64/2 on my HDSP 9652 for anywhere
from 2 - 6 hours and then I'll get a flurry of xruns. I see pretty
much the same problems in Aqualung, which doesn't generally mind the
xruns, or Ardour which will usually shut down when they happen. Folks
here have blamed my complicated setup which uses the Gentoo chroot'ed
32-bit environment for web browsing and 32-bit multimedia only, but
I've run the same tests with all of that turned off and still see that

I see no issues like you are describing with CPU usage, but I'm using
an NForce4 chipset with an ATI PCI Express video card. Possibly it's
an ATI chipset issue.

I could send you a copy of my config file offline.


On 1/17/06, Loki Davison <loki.davison at gmail.com> wrote:
> Has anyone actually got this working? If so how and with what
> settings? I've got 2.6.15 with  patch-2.6.15-rt2 to compile fine and
> boot but the irq handlers seem to use 90% of cpu and the system really
> feels like it's chugging, everything takes 10 to 100 times longer to
> load, and anything musical is impossible. I'm running amd64 3000 on an
> ati chipset based mb. All normal modules, nothing external. I've tried
> with a number of older kernels / patches but i'm wondering if there is
> a magic collection that actually works. ;-)
> Loki

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