how to optimize virtio-vhost in 10G net

[Ding Xiao]

I am test virtio-vhost in 10G environment

host info
cpu E2680@xxxxxx
memory 16G
network intel 82599BE
os centos 7

VM info
cpu 4
memory 4G
network using virtio vhost
os centos 7

I using pktgen to send udp package, the result like follow
64b 230Mb/s
1400b 5.9Gb/s

I test the speed in VMware too, the result like follow
64b 700Mb/s
1400 9.3Gb/s

I am very surprised why the speed with virtio-vhost is slow
so I test to analysis this by using perf tool
I found the tun_sendmsg occupancy rate of 35%
tun_sendmsg using copy_from_user to get the data from VM
Perhaps mapping could improve the performance ?
or other Another improvement method ?
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