Problems with interrupts on 50 Mhz PCI slots.]

I am running TurboLinux 0714 with the kernel updated to test 4 on a four CPU Lion system (A3 processors). The bios is build 55.

I was trying to get a high speed networking card which worked just fine on the 25 Mhz slots to work on one of the 50 Mhz slots. This is when things started to get a little weird.

First, any cards put in those slots ( the pci slots on buses 2-6 ) were all assigned irq 11. There are also a few PCI Hot-plug controllers also on IRQ 11.

Looking at /proc/interrupts revealed some more weirdness:

 11:          0            none  myri/gm
 40:          0  IO-SAPIC-level  perfmon
 48:       2395  IO-SAPIC-level  qla1280
 51:      17177  IO-SAPIC-level  eth0
 64:          6   IO-SAPIC-edge  ide0
 65:          4   IO-SAPIC-edge  ide1
 80:          5   IO-SAPIC-edge  keyboard
 89:        189   IO-SAPIC-edge  PS/2 Mouse
239:     705213           SAPIC  timer

The myri/gm is the driver for the card i am interested in.

First I noticed that there were 0 interrupts on IRQ 11, which is false since i know for a fact that the card generated an interrupt. Then I noticed the 'none' where I expected to see 'IO-SAPIC-level'.

So has anyone seen this before? Is this a known problem?

Nelson Escobar
[email protected]

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