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

[Mike Kazmier <DaKaZ@xxxxxxxxx>]

On Thu, Jan 15, 2009 at 4:44 PM "James Harper" <james.harper@xxxxxxxxxxxxxxxx> 
wrote:
>> 
> > 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
> > 
> 
> So Dom0 is getting around 4000 interrupts a second, and DomU is getting
> around 4200 interrupts a second, so it sounds like both are doing
> interrupt moderation, which is good.
> 
> I notice that eth3 and eth4 are both sharing an interrupt. Is eth4
> active during this time?

No, Eth4 is down.

--Mike 

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