[linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch

[Dave Robillard]

On Thu, 2004-07-22 at 19:16, Florian Schmidt wrote:
> On Fri, 23 Jul 2004 10:25:07 +1200
> Andrew McGregor <andrew at indranet.co.nz> wrote:
> 
> > It is a PCI bus issue.  You simply don't have enough PCI bus cycles 
> > available to do what you want to do.  The resource you're running out of is 
> > bus bandwidth, and there's nothing to be done about it, other than remove 
> > the PCI gfx card from the system.
> > 
> > If you get another dualhead AGP graphics card (anything will do), the 
> > problem should go away.  We have a developer who does lowlatency 
> > multichannel sound stuff on a machine with a Matrox G450 dualhead card no 
> > problem.  I expect my own system (Radeon 9800 Pro and M-Audio 1010LT audio) 
> > would be fine dualhead too, although I only run it singlehead at the 
> > moment.  The 1010LT is 10 channels in and out of 24-bit 96kHz audio and 
> > works great down to 1.5ms buffers, so it is no small bus load itself.
> 
> Hi,
> 
> thanks for the advice. I have tried some more pci cards and a very slow Virge 64
> or something actually reduced the problem. Not completely though. I think i'll 
> get me one of those G450 dual head cards..  
> 
> Florian Schmidt

Be warned.. AFAIK, dual head on Matrox cards (At least the G400 series
anyway) requires the proprietary Matrox "HAL" library, which has caused
nothing but (severe) problems for everyone I've talked to who used it
(corrupt displays usually).

-DR-