[Beowulf] Performance tuning for Jumbo Frames

Patrick Geoffray patrick at myri.com
Tue Dec 15 23:26:23 EST 2009


Rahul Nabar wrote:
> The TSO and LRO are only relevant to TCP though, aren't they? I am
> using RDMA  so that shouldn't matter. Maybe I am wrong.

TSO/LRO applies to TCP, but you can have the same technique with 
different protocol, USO for UDP Send Offload for example.

RDMA is everything you want it to be, but it is not a wire protocol. 
Anyway, NICs that implement zero-copy communication are in a way 
offloading segmentation and reassembly too.

BTW, if your RDMA-capable hardware is running iWarp, it is using TCP on 
the wire.

Patrick
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