Andras> I'm using 'modprobe ib_mthca msi_x=1', and 'MSI INIT
Andras> SUCCESS' is there but /proc/interrupts doesn't show MSI
Andras> being used so I'm puzzled a bit. See dmesg output below.
It seems you have an ancient firmware version (1.18). MSI-X will not
work correctly with firmware older than 3.3.2. In fact it seems
likely that with your FW, the HCA does not even expose an MSI-X PCI
capability. If you do lspci -v, do you see a capability like
Capabilities: [40] MSI-X: Enable+ Mask- TabSize=32
or
Capabilities: [40] #11 [801f]
for your HCA? (Only alpha pciutils 2.1.99 can decode MSI-X
capabilities, so you'll probably see the second version if you see
anything).
If there is no such capability then the driver won't be able to enable
MSI-X interrupts and you'll see the behavior you describe.
- R.
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