What emulated nic are you using? I think only the e1000 emulated nic 
supports 1 GB.

Miguel Araujo wrote:
> Hello all,
>
> I'm testing the last kvm version, 62. I was doing an iperf benchmark to 
> test the network performance in a Feisty virtual machine and I got 
> values surround 100Mbits when my card is actually 1Gbit.  The testing 
> environment is conformed by 2 machines, both with Gbit interfaces. The 
> vm in kvm is running in server mode, the other (not virtualized one) is 
> the client. The vm interface is going to a bridge called br0. Ethtool 
> says the interface is running 100Mbits but it doesn't let me change the 
> speed or any other parameter in the vm.
>
> I can't either change tap0 parameters in kvm host. ¿Is anyone having the 
> same issue?¿am I forgetting something?
>
> Thanks for your time in advanced,
>      Miguel
>
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