[Xen-users] Re: Networking stops working for no apparent reason

[Arik Raffael Funke <arik@xxxxxxxx>]

On 21/01/2010 03:39, James Harper wrote:
> On the surface yes, but the problems I was seeing involved Linux getting
> quite upset and refusing to do any packet routing when TCP offloading
> was in use. Minutes later it would start again. Nothing was ever logged
> anywhere to indicate problems it just stopped routing packets.
The problem desciption "minutes later it would start again" is just what 
is happening to me. I can provoke the xen network to "crash" by doing 
"yum update". After downloading just over 1 MB, it breaks the networking 
for a few minutes before getting back to normal.
I disabled checksum offloading on all network devices (in dom0 and domU) 
but with no effect.
Do you have any other ideas? This is really puzzling to me...

Another thing: while the network is broken, when I try pinging from domU 
to dom0, the result is either "Network unreachable" or sometimes 
"sendmsg: no buffer space available". However I checked with free and 
buffer space is well over 6 MB on domU and dom0.
- Arik


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