[Beowulf] Performance tuning for Jumbo Frames

Patrick Geoffray patrick at myri.com
Tue Dec 15 20:05:26 PST 2009

Rahul Nabar wrote:
> Thanks! So I could push it beyond 9000 as well?

1500 Bytes is the standard MTU for Ethernet, anything larger is out of 
spec. The convention for a larger MTU is Jumbo Frames at 9000 Bytes, and 
most switches support it these days. Some hardware even support Super 
Jumbo Frames at 64K but it's rare (and useless IMHO).

Since Jumbo Frames are out of spec, they are typically not enabled by 
default in switches.


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