Red Hat Bugzilla – Bug 432196
Enable Infiniband connected mode support (CONFIG_INFINIBAND_IPOIB_CM) in kernel config
Last modified: 2008-11-26 10:48:31 EST
Description of problem:
CONFIG_INFINIBAND_IPOIB_CM is not enabled in the configuration of kernels that
Fedora ships. This means that users of connected mode must build their own kernels.
With CONFIG_INFINIBAND_IPOIB_CM enabled connected mode is still not activated
until a user asks for it through sysfs, i.e. "echo connected >
/sys/class/net/ib0/mode", so activating the option does not result in a change
of default behavior.
Without connected mode infiniband can only use a 2k MTU for IP traffic.
Large MTUs can result in significant performance increases (150 MBytes/sec TCP
-> 700Mbytes/sec TCP, on my systems when changing to 64k MTU).
Infiniband connected mode is not available.
Infiniband connected mode is available.
Enabled in rawhide.
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It was fixed 2008-02-10 and was fine in Fedora 9.