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

[Miguel Araujo <maraujo@Nosys.net>]

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Hello again,

I want to thank you for the information given. Now I understand what you 
mean, I'm going to test virtio drivers with the last kernel possible. 
Thanks a lot.

Regards,
    Miguel

Haydn Solomon escribió:
> See also
>
> http://www.linux-kvm.com/content/tip-how-setup-windows-guest-paravirtual-network-drivers
>
> On Thu, Apr 3, 2008 at 10:54 AM, Felix Leimbach 
> <felix.leimbach@gmx.net <mailto:felix.leimbach@gmx.net>> wrote:
>
>     > 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?
>
>
>     Hey Miguel,
>
>     what Haydn meant was to force qemu to *emulate* a e1000 NIC
>     instead of the default RTL8139. That emulation is done by qemu in
>     userspace and has absolutely nothing to do with your physical NIC
>     por the bridge.
>     Chosing a NIC is done with the "model=" parameter.
>     kvm -net nic,model=e1000
>
>     Even better performance-wise would be to use the new virtio
>     interface which paravirtualizes your physical NIC instead of
>     emulating one.
>     For that, use:
>     kvm -net nic,model=virtio
>
>     Of course you'll need to install the corresponding drivers in your
>     guest. The e1000 should be supported in every guest and for the
>     virtio interface there are windows guest drivers (see the
>     kvm-announce mailing list for that) as well as linux guest drivers
>     included in kernel 2.6.25 upwards.
>
>     By the way: This is good stuff f you're interested in hard disk
>     performance, too: http://kvm.qumranet.com/kvmwiki/Virtio
>
>     Felix
>
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