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On 2014-1-3 13:52, sylecn wrote:
> I have found the cause of the problem. When you use eth1 as br-ex where
> eth1 is not connected to internet, and use an iptables NAT rule as
> software gateway to internet, you need to turn off GRO on both eth0 and
> eth1.
>
> After turning off GRO on eth0, download speed inside vm has become normal.

Does anybody know that, if turning off GRO on eth0 (the public 
interface), is there any potential problems for internet traffic? Thanks.