On Fri, May 31, 2013 at 5:17 PM, Eugene Istomin <e.isto...@edss.ee> wrote: >> This is dependent on the hypervisor and not being restricted by OVS. >> However, the direct benefits of vlan offloading are very minimal and >> are really only useful in relation to enabling other offloads. > > In my testbed results are not minimal (untagged by OVS have ~2 times more > bandwith than untagged by VM) > > All interfaces have MTU=9000 > > > 1)untagged by VM interface (in OVS like "trunks: [1002]") > > #atop from VM > NET | transport | tcpi 22733 | tcpo 80191 | udpi 0 | udpo > 4 | > NET | eth0 ---- | pcki 22736 | pcko 80243 | si 12 Mbps | so 5777 > Mbps | > NET | vlan100 ---- | pcki 22738 | pcko 80245 | si 9495 Kbps | so 5775 > Mbps | > > #atop from Dom0 > CPU | sys 57% | irq 39% > cpu | sys 58% | irq 41% > .. > NET | vif1.0 ---- | pcki 227727 | pcko 797502 | si 10 Mbps | so 5743 > Mbps > NET | vif2.0 ---- | pcki 797748 | pcko 227717 | si 5736 Mbps | so 12 > Mbps > > > > 2) untagged by OVS interface (in OVS like "tag: 1002") > #atop from VM - untagged by OVS interface > NET | transport | tcpi 8495 | tcpo 163131 | udpi 0 | udpo 0 > NET | eth1 ---- | pcki 8495 | pcko 24718 | si 4485 Kbps | so 11 Gbps > > #atop from Dom0 > CPU | sys 96% | irq 4% > cpu | sys 96% | irq 4% > .. > NET | vif1.1 ---- | pcki 75974 | pcko 247608 | si 3160 Kbps | so 11 > Gbps > NET | vif2.1 ---- | pcki 247616 | pcko 75971 | si 11 Gbps | so 4011 > Kbps > > > As you can see second variant have full netback sys load in DOM0. Second have > high number > of irq and high numbers of pcki/pcko. > Is this behavior correct?
You are seeing the result of TSO not functioning in the presence of vlans. This is one of the other offloads that I was referring to before but it's not directly the result of the features that you showed. Regardless, this is a limitation of Xen and not something that OVS affects. _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
