[openib-general] RC v/s UD

john t johnt1johnt2 at gmail.com
Tue Nov 14 22:26:50 PST 2006


Hi,

I ran "ibv_rc_pingpong" and "ibv_ud_pingpong" utilities and found that RC
gives a BW of 4302 Mbit/sec and UD gives a BW of 2133 Mbit/sec on my setup
(2 hosts connected to a switch). So it seems UD is inefficient then RC
(gives almost half the BW as that of RC). Is this expected? Isnt it true
that UD involves less overheads then RC?

Are there ways to get maximum BW (close to RC) from UD?

Regards,
John T.
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