Comment 2 for bug 584048

I am also observed network freeze.
Used virtio drivers for network and for disk too (for WinXP/Win7 x86 guests),
On every guest shutdown and sometimes on guest start-up network connection (to host and to guests) is interrupted from 2 seconds up to 10 seconds (sometimes more, it vary).

My case:
Lucid x64 with eucalyptus installed on quad-core Intel CPU (motherboard 'Asus P6T SE'), network is bridged.
Running kvm manually as well as using eucalyptus cloud - always same network freeze occur.