Re: no-carrier on qlogic 8242 10gig with linux 3.x running xen

[Kristoffer Harthing Egefelt <k@itoc.dk>]

>How about pci=nomsi on kernel (i.e. vmlinuz) command line?

That worked! The card is now working with legacy interrupts:

[  143.767091] QLogic 1/10 GbE Converged/Intelligent Ethernet Driver v5.0.25
[  143.767222] xen: registering gsi 38 triggering 0 polarity 1
[  143.767238] xen_map_pirq_gsi: returning irq 38 for gsi 38
[  143.767242] xen: --> pirq=38 -> irq=38 (gsi=38)
[  143.767245] Already setup the GSI :38
[  143.767250] qlcnic 0000:03:00.0: PCI INT A -> GSI 38 (level, low) -> IRQ
38
[  143.767267] qlcnic 0000:03:00.0: setting latency timer to 64
[  143.768057] qlcnic 0000:03:00.0: 2MB memory map
[  144.403025] qlcnic 0000:03:00.0: phy port: 0 switch_mode: 0,
[  144.403027] 	max_tx_q: 1 max_rx_q: 8 min_tx_bw: 0x0,
[  144.403029] 	max_tx_bw: 0x64 max_mtu:0x2580, capabilities: 0x6affae
[  144.411026] qlcnic 0000:03:00.0: failed card response code:0x10
[  144.411099] qlcnic 0000:03:00.0: Can't get template size 16
[  144.411102] qlcnic 0000:03:00.0: firmware v4.7.83
[  144.419028] qlcnic: 24:b6:fd:64:1e:45: QME8242-k 10GbE Dual Port
Mezzanine Card Board Chip rev 0x54
[  144.419075] qlcnic 0000:03:00.0: using legacy interrupts
[  144.419842] qlcnic 0000:03:00.0: eth0: XGbE port initialized

Irq 38 is now visible in /proc/interrupts

But what might the consequences be of this? 
The NIC currently share irq with the raid card - should I expect a
performance hit?
The dom0 is going to have 1 core dedicated.

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