eth0: transmit timed out

[Arne Kepp <ak@openplans.org>]

Hi,

I am running KVM 61 on CentOS 5.1 x86_64 (on a Dell PowerEdge 2950 
III).  I start my virtual machine as follows:
qemu-kvm -hda /dev/kvm_sdb/geust_root -m 1024 -net tap -net 
nic,vlan=0,macaddr=00:16:3e:00:00:02 -daemonize -nographic -smp 2

The problem is that when the guest (also CentOS 5.1 x86_64) utilizes the 
network heavily (scp to a machine on the same switch, around 12 mbyte/s) 
the network on the virtual machine just drops out.

I can no longer ping the virtual machine, and any existing SSH sessions 
die. If I connect to the virtual machine using VNC everything looks okay 
(eth0 is up, routes are okay), but I still cannot connect to anything. 
All other virtual machines on the same host continue to work as if 
nothing has happened. The same problem occurred in -58 and -59.

/var/log/messages on the guest says:
NETDEV WATCHDOG: eth0: transmit timed out
eth0: link up, 100Mbps, full-duplex, lpa 0x05E1

Any suggestions (permanent fixes or temporary workarounds, I'll take 
what you got) would be much appreciated.

Thanks for all the great work :)
-Arne

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