[ewg] Issue with IPoIB-CM being enabled at boot

[Jeremy Brown]

I apologize for replying to myself, but I just set up two em64t systems
with Mellanox HCAs, Fedora 4, and a fresh build and installation of OFED
1.2, and the IPoIB interfaces came up in datagram mode, despite the fact
that IPoIB is enabled and configured to come up in connected mode.

# Load IPoIB
IPOIB_LOAD=yes

# Enable IPoIB Connected Mode
SET_IPOIB_CM=yes

Does anybody else see this issue? Obviously, it's not a problem for me
to manually switch it to connected mode using the /sys interface.

Thanks!

Jeremy Brown

On Thu, 2007-06-28 at 18:02 -0700, Jeremy Brown wrote:
> I've installed OFED 1.2 (GA) on an Opteron system with SLES 10 installed
> and a QLogic QHT7140 (HTX-connected InfiniPath card). The contents
> of /etc/infiniband/openib.conf are the defaults created by the OFED
> install script, which include enabling IPoIB-CM, and they look good to
> me. I've attached the file.
> 
> When I boot up, /sys/class/net/ib0/mode shows "datagram," however, and
> the MTU is set to 2044. The performance characteristics are such that
> I'm sure it really is in datagram mode. When I manually change it to
> "connected" mode, and set MTU to 65520, throughput increases
> dramatically, as expected, so I'm sure it really is going into connected
> mode.
> 
> Does anybody else have a problem with IPoIB coming up in datagram mode,
> when you've configured it for connected mode (in openib.conf)? Can
> anybody see what I've done wrong here?
> 
> Thanks a lot!
> 
> Jeremy Brown
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