[mythtv-users] OT? /proc/pci

[Kevin Kuphal]

Sean Covel wrote:

>
>
> 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

Do you have another computer (preferably a Windows machine) that you can 
test to see if the card is alive? 

Kevin