Hi, I have a program running with openMPI over a network using a gigabit switch. This switch supports jumbo frames up to 13.000 bytes, so, in order to test and see if it would be faster communicating with this frame lengths, I am trying to use them with my program. I have set the MTU in each node to be 13.000 but when running the program it doesn't even initiate, it gets blocked. I have tried different lengths from 1.500 up to 13.000 but it doesn't work with any length.
I have searched and only found that I have to set OMPI with "-mca btl_openib_ib_mtu 13000" or the length to be used, but I don't seem to get it working. Which are the steps to get OMPI to use larger TCP packets length? Is it possible to reach 13000 bytes instead of the standard 1500? Thank yo in advance, Alberto
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