[openib-general] ip over ib throughtput

[Grant Grundler]

On Tue, Jan 11, 2005 at 04:37:38PM -0800, Grant Grundler wrote:
> I'll try to get some netperf numbers for IPoIB next (with msi_x=1)...

I forgot to mention why with "msi_x=1" and not with "msi=1":
ionize:~# modprobe ib_mthca msi_x=1
ib_mthca: Mellanox InfiniBand HCA driver v0.06-pre (November 8, 2004)
ib_mthca: Initializing Mellanox Technology MT23108 InfiniHost (0000:81:00.0)
GSI 60 (level, low) -> CPU 0 (0x0000) vector 63
ACPI: PCI interrupt 0000:81:00.0[A] -> GSI 60 (level, low) -> IRQ 63
MSI INIT SUCCESS
ionize:~#
...
[ mess with tg3 driver for a bit ]

ionize:/home/grundler# rmmod ib_mthca
ionize:/home/grundler# modprobe ib_mthca msi=1
ib_mthca: Mellanox InfiniBand HCA driver v0.06-pre (November 8, 2004)
ib_mthca: Initializing Mellanox Technology MT23108 InfiniHost (0000:81:00.0)
ACPI: PCI interrupt 0000:81:00.0[A] -> GSI 60 (level, low) -> IRQ 63
Can't enable MSI. Device already had MSI-X vectors assigned
ionize:/home/grundler# 

i.e. one can't switch from MSI-X to MSI for a particular device.
Roland and I both suspect this is probably something to do with
core MSI support. 

grant