From KVM
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=== Obtaining the code ===
 
=== Obtaining the code ===
  
* git clone git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git
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you need the at least qemu-kvm-0.13.0 (http://sourceforge.net/projects/kvm/files/qemu-kvm/)
* git checkout refs/remotes/origin/stable-0.13
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* cd kvm
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* compile as usual
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=== kernel requirements ===
 
=== kernel requirements ===

Revision as of 12:41, 13 January 2011

As of September 2010, vhost is not included in any released tarballs, so you need the git version.

VhostNet provides better latency (10% less than e1000 on my system) and greater throughput (8x the normal virtio, around 7~8 Gigabits/sec here) for network.

Obtaining the code

you need the at least qemu-kvm-0.13.0 (http://sourceforge.net/projects/kvm/files/qemu-kvm/)

kernel requirements

On the host you need a kernel with CONFIG_VHOST_NET=y and in the guest you need a kernel with CONFIG_PCI_MSI=y

example command line

To start a guest with vhost:

  • /usr/bin/kvm -netdev type=tap,id=guest0,script=kvm-ifup,vhost=on -device virtio-net-pci,netdev=guest0,mac=00:16:3e:00:00:01 ..other options..

Caveats

Some DHCP clients have problems with this implementation, more details here.