[CentOS] Network card help please

John R Pierce pierce at hogranch.com
Wed Sep 10 07:03:07 UTC 2008


nate wrote:
> John R Pierce wrote:
>
>   
>> IRQ's are fully sharable on PCI, all PCI devices can use a single
>> hardware IRQ with no problems.
>>     
>
> In theory yes, in practice these days usually yes but it's by no
> means a guarantee it will work. It's been a few years since I
> had IRQ sharing issues, but when it did happen it was on the
> PCI bus. Perhaps broken devices, perhaps broken bios(s), who
> knows but it can happen. And when dealing with Linksys, I'm
> sure the possibility of 'broken devices' skyrockets pretty
> fast.
>
>   

IRQ problems wouldn't prevent LSPCI from enumerating the PCI devices


>> I'd suggest trying the NIC in a different slot.
>>     
>
> Most often what happens in a different slot is a different IRQ
> is assigned. (Usually only a small range of IRQs are available
> for each PCI slot)
>   

or the slot its in is broken.  I've seen boards with bad PCI slots, 
typically a broken select, so the device plugged into that slot simply 
didn't show up.

or the card itself is broken, whereupon, well, replace it.




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