[PVE-User] Network performance on 1.6

Pete Ashdown pashdown at xmission.com
Wed Oct 6 23:36:50 CEST 2010

I posted this on the forums, but wanted to make sure the developers saw this.

I thought you might be interested in this email from the KVM mailing list. I
have verified the results on a Ubuntu guest on ProxMox 1.6 with ethtool and
offloading is not being used, and as a result my ethernet performance is about
35% slower than native.

  Not sure what userspace you are using, but you are probably not getting
  any of the useful offload features set. Checking "ethtool -k $ETH"
  in the guest will verify that.

  Try changing this:

   -net nic,macaddr=52:54:00:35:11:f1,vlan=0,model=virtio, name=virtio.0 \
   -net tap,fd=51,vlan=0,name=tap.0

  to use newer syntax:

   -netdev type=tap,id=netdev0
   -device virtio-net-pci,mac=52:54:00:35:11:f1,netdev=netdev0

  With just a 1Gb link, you should see line rate from guest via virtio.


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