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xen-users
Re: [Xen-users] domU network interface half-dies regularly
I had the same problem yesterday. One of the domU running on a server
had the same symptoms: TX counter stopped while the RX one was
increasing normally.
I'm running Centos 5.3 with 2.6.18-92.1.22.el5xen on the dom0 and CentOS
5.2 with 2.6.18-92.1.22.el5xen on the domU.
Rebooting the domU solvs the problem, but it isn't an attractive
solution...
Daniel.
* Mariusz Mazur <mmazur@xxxxxxxxx> [03/15/2010 07:10]:
> I'm trying to figure out how to debug this. Any suggestions would be
> appreciated.
>
> Every once in a while a random domU on a random xen server of ours has its
> network interface die. I've recently figured out what the exact symptoms are:
> TX count on that interface (as seen from inside the domU) stops increasing.
> There's no way of actually sending anything from within the domU. Even arp
> packets aren't sent. Everything works fine with receiving packets however.
>
> Of the things I did check:
> - Doing an ip set link down/up on both dom0/domU doesn't do anything.
> - Removing/reattaching the dom0 interface from/to its bridge doesn't help.
> - It's interface-specific. I'm currently logged onto a domU that has one of
> its net interfaces half-dead as described, but the other perfectly functional.
> - Interestingly, the problem prevents "xm save" from working. It timeouts
> without anything getting written to disk (except a kilobyte or so of, I'm
> guessing, some headers).
> - I'm seeing this problem across:
> - 2.6.18 xen.org dom0 3.3.X and 3.4.X
> - xen.org hypervisor 3.3.X and 3.4.X
> - domU xen.org 2.6.18.8_xen3.3.0U
> - kernel.org 2.6.29.6 (pvops)
> - A few different machines from different vendors.
> - Nothing in dom0/domU kernel logs.
>
> Whatever the cause is, I seriously doubt it's domU's fault, considering I'm
> seeing the problem on both xen.org and kernel.org domU kernels. I also don't
> know what the trigger is (plus, those are production systems), so enabling a
> bunch of DEBUG prints in xen isn't much of an option.
>
> Any suggestions/hints on where to look next? I'm guessing there are ways of
> inspecting various network code structures.
>
> --mmazur
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
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