Re: (repeatable) cross-domain networking failure

[Nivedita Singhvi <niv@us.ibm.com>]

mukesh agrawal wrote:
> 
> Summary:
> 
> After sending some UDP traffic between two xen domains (Domain 0 and 
> Domain 1) the networking between the domains fails. This failure is 100% 
> repeatable.

I don't have boxes at the moment and can't reproduce till
Monday, but can you show us the output of netstat -uan and
netstat -s on both domains? Is there stuff in the receive
or send queues? And was all the udp traffic going to the
same port? i.e. any successful udp traffic to another
endpoint?

> I then start a UDP server in D0, and a traffic generator in D1. After 
> the traffic generator sends its 128-th packet, networking between the 
> domains fails. The 128th packet is received successfully by the UDP 
> server, but no later traffic arrives in D0. This includes UDP, TCP, 
> ICMP, and ARP.

What does ifconfig on dom0 show?
Are there any error messages in /var/log/messages?

> Looking at the interrupt counts in /proc/interrupts, I see that D0 no 
> longer receives packets sent by D1. D1, however, does receive packets 
> sent by D0. (To be clear, D0->D1 traffic is ICMP ping requests, 
> unrelated to the UDP traffic. There is not UDP traffic sent from D0 to D1.)

Is there any other successful traffic from D0 -> D1 (tcp?)

thanks,
Nivedita




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