On Thu, 06 Sep 2012 10:02:11 -0700
Kevin Cosgrove wrote:
FWIW, I have a similar system with an Asus P8Z68-V PRO GEN3 + Intel
i7-2600k CPU, I have an rme multiface PCI card in a slot that gives it
IRQ 18 all to itself. The only irq priority manipulation I do is to
run chrt -f -p 98 `pgrep irq/18-snd_hdsp` from /etc/rc.local.
I also have the system running with the default ondemand governor.
I don't use an external NVIDIA card as the built in HD3000 GPU works
a treat for low latency audio even with a full KDE install with
compositing kwin. If I did use a NVIDIA card I would most likely use
the nouveau driver that lately has become very good for low latency
Kernel is 3.4.9-rt17. Running cyclictest -m -Sp99 -i100 -d0 shows me
kernel scheduling latencies of well under 0.1ms no matter how hard i
push the system, and that is with the ondemand governor...
All in all very pleased with this system, and I think you will be
too if you move the soundcard to another slot, having less stuff on it.
Another tip, if you have to use a slot that shares IRQs, then you have
to raise the priority of all the soft interrupt threads that share
the IRQ with the soundcard, otherwise you will get a lot of xruns.
Linux-audio-user mailing list