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). How reproducible: Install Fedora Actual results: Infiniband connected mode is not available. Expected results: Infiniband connected mode is available.
Enabled in rawhide.
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It was fixed 2008-02-10 and was fine in Fedora 9.