[ovs-discuss] Xen/OVS - VLAN offloading

Eugene Istomin e.istomin at edss.ee
Fri May 31 03:52:52 UTC 2013


Hello,

i'm trying to understand Xen/OVS -  VLAN offloading


In my testbed:

#ovs-vsctl show
 Bridge vlannet
        Port "vif5.0"
            tag: 1002
            Interface "vif5.0"
        Port vlannet-bond
            Interface "vlannet2"
            Interface "vlannet1"
        Port vlannet
            Interface vlannet
                type: internal
        Port "vif3.0"
            tag: 1002
            Interface "vif3.0"
    ovs_version: "1.10.0"

1) Xen Dom0 HW interface -> 
ethtool -k vlannet1 

..
rx-vlan-offload: on
tx-vlan-offload: on
rx-vlan-filter: on [fixed]
..

2) OVS system interface -> 
ethtool -k ovs-system

..
rx-vlan-offload: off [fixed]
tx-vlan-offload: on
rx-vlan-filter: off [fixed]
..
   

3) DomU netback interface ->
ethtool -k ovs-system

..
rx-vlan-offload: off [fixed]
tx-vlan-offload: off [fixed]
rx-vlan-filter: off [fixed]

..


As i see, VLAN offloading is partially implemented in OVS and didn't 
implemented in Xen means VLAN tagged traffic inside VM will make 
additional latency. 

Can anyone have info about OVS->VM VLAN offloading configuration?

Thanks.
-- 
*/Best regards,/*
/Eugene Istomin/

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