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[Xen-users] Heavy Dom0 traffic stops network

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Subject: [Xen-users] Heavy Dom0 traffic stops network
From: Simon Hobson <linux@xxxxxxxxxxxxxxxx>
Date: Sun, 11 Oct 2009 16:12:29 +0100
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I've just experienced a rather strange one ...

I was trying to create a new DomU using debootstrap as I've done before - and everything stopped, quickly followed by a voice from downstairs asking why the internet had stopped ! This first happened yesterday, and assuming I'd perhaps managed some form of resource exhaustion I rebooted the system.

Today I tried again (but without the "when will it be working ?" from downstairs) and found this.

If I do a ping from my laptop to a DomU, then the responses just stop a short while after I hit the network from Dom0 (it only takes a few MB). If I stop the traffic and wait, then it all comes back again after about 5 minutes :

64 bytes from icmp_seq=465 ttl=64 time=0.290 ms
64 bytes from icmp_seq=466 ttl=64 time=0.292 ms
64 bytes from icmp_seq=467 ttl=64 time=0.338 ms
64 bytes from icmp_seq=468 ttl=64 time=297024.510 ms
64 bytes from icmp_seq=469 ttl=64 time=296024.293 ms
64 bytes from icmp_seq=470 ttl=64 time=295024.138 ms
Note that packets don't seem to have been lost, just queued up.

"brctl showmacs eth0" shows MAC addresses aging in the bridge.

Dom0 has one bridge on the inside network, internet access is via a router running in a DomU with external ethernet interface made available to it via pciback.

Dom0 is Debian Etch, linux-image-2.6.18-6-xen-amd64  2.6.18.dfsg.1-23etch1
running on xen-hypervisor-3.2-1-amd64  3.2.1-2~bpo4+1

The guests are running Lenny.

Nothing appears to be logged when the problem happens. Any ideas ?

Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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