[ovs-discuss] performance drop 60% when using vxlan tunnel

Jesse Gross jesse at nicira.com
Wed Nov 5 16:08:11 UTC 2014


On Tue, Nov 4, 2014 at 11:03 PM, FengYu LeiDian
<fengyuleidian0615 at gmail.com> wrote:
> Hi
>
> Env: redhat 6.4, OpenvSwitch-2.1.2, using native
> datapath/linux/openvswitch.ko module
>
> VM1 on host1, VM2 on host2, host1 and host2 are connected by a switch.
> both VM enable virtio/vhost when launching VM
>
> case1:
> VM -> tap -> ovs-bridge -> eth1
>
> case2:
> VM -> tap -> ovs-bridge -> vxlan -> eth1
>
> When using vxlan in case2, iperf performance drop 60%,

Your NIC probably doesn't support offloads (checksum, TSO, etc.) in
the presence of VXLAN.



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