最近在配置IB集群，发现40Gbps的IB集群中传输速度远没有达到理论值，简单查了下发现是MTU（Maximum transmission unit）的问题。
于是尝试修改了一下MTU的大小进行比较，结果如下：
venet0 mtu 1500 (default) [ 5] 0.00-10.04 sec 1.31 GBytes 1.12 Gbits/sec receiver venet0 mtu 9000 [ 5] 0.00-10.04 sec 6.64 GBytes 5.68 Gbits/sec receiver venet0 - mtu ~ 65к [ 5] 0.00-10.04 sec 17.0 GBytes 14.5 Gbits/sec receiver
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