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

[Felix Leimbach <felix.leimbach@gmx.net>]

[-- Attachment #1.1: Type: text/plain, Size: 1108 bytes --]

>  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

[-- Attachment #1.2: Type: text/html, Size: 1540 bytes --]

[-- Attachment #2: Type: text/plain, Size: 278 bytes --]

-------------------------------------------------------------------------
Check out the new SourceForge.net Marketplace.
It's the best place to buy or sell services for
just about anything Open Source.
http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace

[-- Attachment #3: Type: text/plain, Size: 158 bytes --]

_______________________________________________
kvm-devel mailing list
kvm-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/kvm-devel