Re: Test vhost-net !!

[Jean-Philippe Menil <jean-philippe.menil@univ-nantes.fr>]

Le 09/04/2011 16:25, Asdo a écrit :
> On 04/07/2011 09:33 AM, Jean-Philippe Menil wrote:
>> Le 07/04/2011 09:18, Onkar Mahajan a écrit :
>>> Hi ,
>>>      How do I test if vhost-net is actually enabled and working ? Hi,
>>> ...
>>
>> you must modprobe the vhost_net module on your host:
>> ...
>> and you need to pass "vhost-on" on your command line:
>> http://www.linux-kvm.org/page/VhostNet
>> ...
>> Regards.
>>
>
> Are you really able to make vhost_net work?
>
> I compiled from source KVM 0.13.0 and recently also 0.14.0 on intel xeon
> 54xx and 56xx, on newly installed Ubuntu with vanilla kernel 2.6.37, and
> when I tried to enable vhost_net (modprobe the module then restart KVM)
> the emulation was going 100x slower than normal, so I had to disable it.
> See my old message in this ML "vhost disables kvm acceleration"
>
> What did you do to make it work? Did you compile KVM from sources? On
> what kernel? AMD or Intel?
> Also, are you not using libvirt maybe?
>
> Thank you
>
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Hmm, something must be wrong in your configuration.
I use successfully vhost_net module on 2.6.38 with qemu-kvm 0.14.0 
compiled from sources. Run fine on amd, must run fine on intel too.
If you use libvirt, you must restart the libvirt dameon after modprobe 
the vhost_net module, otherwise libvirt don't append the vhost=on parameter.

Can you provide your command line? and what guest are you running?

-- 
Jean-Philippe Menil - Pôle réseau Service IRTS
DSI Université de Nantes
jean-philippe.menil@univ-nantes.fr
Tel : 02.53.48.49.27 - Fax : 02.53.48.49.09