[Xen-users] Millions of errors/collisions on physical interface in routed Xen-setup??

["Rustedt, Florian" <Florian.Rustedt@xxxxxxxxxxx>]

Hello List,

Because of lost packets, we began to do some research on the networking in Xen.
Out Xen 3.3.0 host has got a handfull domUs with routed networking and linux in 
paravirtual configuration.

Now, we've got lot's of packetlost on the virtual interfaces in the domUs and 
in betweeen we believe that this is based on the errors on the host interface 
(uptime 47 days).

eth0      Link encap:Ethernet  HWaddr 00:XX:XX:XX:XX:XX
          inet addr:212.XX.XX.XX  Bcast:212.XX.XX.255  Mask:255.255.255.0
          inet6 addr: xxxx::xxx:xxxx:xxxx:xxxx/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:250388860 errors:8180755 dropped:131050 overruns:0 
frame:22483
          TX packets:183684213 errors:0 dropped:0 overruns:0 carrier:0
          collisions:14726679 txqueuelen:1000
          RX bytes:231736594230 (215.8 GiB)  TX bytes:43873538477 (40.8 GiB)
          Interrupt:20 Memory:fd7f0000-fd800000

Very strange are first the massive collisions, as it is routed and second, that 
sending has no errors? How can that be possible?

So, how does routed networking in xen work in detail? How can we solve this?

Kind regards, Florian
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