Red Hat Bugzilla – Bug 845484
qperf: ud_bw ud_bi_bw ud_lat tests failed when the message size is larger than 2K for 'Local length error'
Last modified: 2013-03-07 19:09:12 EST
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This is not a bug. The InfiniBand spec says that UD queue pair types can only support data transfers as large as the physical MTU of the link. What you are seeing is normal whenever the physical MTU of the link is 2k.