RE: [Xen-users] Lots of udp (multicast) packet loss in domU

[Mike Kazmier <DaKaZ@xxxxxxxxx>]

Hi James, I accidently sent this directly to you and not the list... so sorry 
for the double email,

Our physical eth3 is connected to xenbr2 which is used to send info to the domU.

> Hmmm... well if you have 600Mbps traffic of 1316 bytes per packet, that
> is ~60Mbytes/second / 1316 bytes = ~45000 packets per second.
>
> While things are going at 600Mbps, please try the following in both Dom0
> and DomU:
>
> cat /proc/interrupts && sleep 10 && cat /proc/interrupts
>
> That should get a very approximate count of interrupts over a 10 second
> period. what is the difference (after - before) for:
>
> Dom0 physical Ethernet interface
> Dom0 vif (backend) interface
> DomU eth0

Dom 0
36: 14136682 0 Phys-irq-level eth3, eth4
36: 14176719 0 Phys-irq-level eth3, eth4
Diff: 40037

275: 254326 0 Dynamic-irq-level vif8.2
275: 259086 0 Dynamic-irq-level vif8.2
Diff: 4760

Dom U
277: 1105308 0 0 0 0 Dynamic-irq eth2
277: 1147909 0 0 0 0 Dynamic-irq eth2
Diff: 42601

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