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

[Miguel Araujo <maraujo@Nosys.net>]

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Hello all,

Thanks for your answer Haydn, but I did not understand the issue too. 
Victor has explained my problem clearly, is kvm uncapable of running the 
bridge at 1GBit if it is not a e1000 network card?

Thanks a lot in advanced,
Miguel
> 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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