Thank you, i will continue this discussion in xen maillists. -- */Best regards,/* /Eugene Istomin/
> 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.
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