Re: virtual machines network goes 100Mbit when interface is Gbit

[Victor Abeytua Garcia <victor@Nosys.es>]

Hello,
    I'm not sure if I understand you. Do you mean that the physical
network cards should be e1000 or that the virtual machines must somehow
emulate e1000 network cards?

    As I understand Miguel's post, he is finding an issue with the
bridge's speed (two virtual machines running on the same physical
machine are limited to 100 Mbps between themselves).

    Best regards,
    Víctor


Haydn Solomon escribió:
> 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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-- 
Víctor Abeytua García

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