[mythtv-users] OT? /proc/pci

[Sean Covel]

Jason Kraftcheck wrote:
> Joel Anderson wrote:
> 
>>Marc-David Meijer wrote:
>>
>>As I understand it, PCI devices don't depend on IRQs anyway.  They use
>>interrupt "channels", and IRQs are just kept around to keep legacy stuff
>>happy.  You will often see many devices appear to "share" the same IRQ,
>>but it is not really true since IRQ's can't really _be_ shared.
>>
>>Someone please comment if I haven't explained this correctly.  It's a
>>simplification, but it basically means that IRQ issues shouldn't come
>>into play unless you have some legacy hardware in the system also.
> 
> 
> I'm no expert either, but I think they are actually "shared".  The
> interrupt handler must poll each device by invoking the interrupt
> handler in the driver for each device sharing the interrupt.  Thus
> there's a slight performance loss when sharing interrupts, and also the
> possibility for buggy drivers to interfere with each other.
> 
> 
> 
This is all interesting theory, but the problem remains, and gets more 
interesting...

I removed everything except the video and IDE card, and put the 250MCE 
back in.  Still not recognized.  I removed the 250MCE and put the 250 
back in.  It worked fine.  Ok, maybe the 250MCE is just hosed?

I put the 250MCE into my "play" box, and it comes right up.  For some 
reason, the other box just doesn't like the 250MCE.  Anyone see this 
behavior?

The two remaining cards in the old box are a GeForce4 440 MX AGP 8x, and 
a Silicon Image, Inc. (formerly CMD Technology Inc) PCI0680 Ultra 
ATA-133 Host Controller, running the 2 HDs and a CDROM.

Any thoughts?

Sean