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Thanks for visiting our forum and using The Intel X520 Ethernet adaptors. Unfortunately the X520 does not support Jumbo Frames when using SR-IOV.
I am putting the finishing touches on a white paper (which I will publish here) on bonding with SR-IOV, should be available in a couple more weeks.
If you explain how you have the bonding setup, and what you are trying to accomplish, we may be able to offer some advice.