linuxaudio.org

On Nov 12, 2007 6:21 PM, Pieter Palmers  wrote:

quoted text
> Cory K. wrote:

> > The Ubuntu Studio team is considering shipping Compiz (with a minimal

> > config) in Ubuntu Studio-Hardy 8.08.

> >

> > Some have said that moving the drawing of windows off the the GFX card

> > would help the load on the CPU and thus keep xruns to a minimum.

> >

> > Any thoughts/ideas on this one?

>

> My stance would be that xruns are not that much dependent on load as

> they are on interrupts. If your machine is not at the maximum of its

> capabilities, xruns only seem to occur when certain I/O related events

> are happening. One of the most problematic I/O types in my experience is

> the video card I/O. So the question is whether you're not making things

> worse.

>

> When running a properly configured RT-patched kernel that prioritizes

> the video card IRQ low enough, it could be a good idea. When the config

> is bad, it will IMHO only increase the problems.

Since recently, I'm using compiz-fusion on my music laptop. Luckily,

my IRQs are not a bother as long as I don't use the internal sound

card :

 16:     150106   IO-APIC-fasteoi   uhci_hcd:usb5, HDA Intel,

radeon@pci:0000:01:00.0

 17:          7   IO-APIC-fasteoi   yenta, hdsp
Latency is set to 2.66ms. The most problematic clients causing runs on

my system are those unadapted to RT work (xmms2 and mplayer...) and

it's only a dozen/hour...
But still, I get a few random xruns that seem to happen without any

explainable cause... Not sure what they are. I'll have to dig a bit

more someday.

__________________

Marc-Olivier Barre,

MarcO'Chapeau.