Loss of network connectivity with high load

[Daniel Bareiro <daniel-listas@gmx.net>]

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Hi all!

I'm using Linux 2.6.31.13 compiled with the kernel.org source code on
KVM host with Debian GNU/Linux Lenny amd64. Also I'm using Debian
GNU/Linux Lenny amd64 virtual machine with kernel 2.6.26-2 from Debian
repositories. I'm using qemu-kvm 0.12.3.

These are the parameters I'm using to start the virtual machine:


escher:~# ps ax|grep kvm
 6299 ?        Rl   113:40 /usr/local/qemu-kvm/bin/qemu-system-x86_64
-drive file=/dev/vm/belvedere-raiz,cache=none,if=virtio,boot=on -drive
file=/dev/vm/belvedere-u01,cache=none,if=virtio -drive
file=/dev/vm/belvedere-u02,cache=none,if=virtio -drive
file=/dev/vm/belvedere-u03,cache=none,if=virtio -drive
file=/dev/vm/belvedere-u04,cache=none,if=virtio -drive
file=/dev/vm/belvedere-u05,cache=none,if=virtio -drive
file=/dev/vm/belvedere-u06,cache=none,if=virtio -drive
file=/dev/vm/belvedere-u07,cache=none,if=virtio -drive
file=/dev/vm/belvedere-u08,cache=none,if=virtio -drive
file=/dev/vm/belvedere-u09,cache=none,if=virtio -m 3072 -smp 2 -net
nic,model=virtio,macaddr=00:16:3e:00:00:56 -net tap -daemonize -vnc :2
-k es -localtime -monitor telnet:localhost:4002,server,nowait -serial
telnet:localhost:4042,server,nowait


When I try to copy directories of several gigabytes in this VM using
rsync to other hosts, this virtual machine loses connectivity with the
rest of the network. Checking, using a serial console connection,
/var/log/syslog and /var/log/messages in search of the problem, I don't
see information that might give a clue to the problem.

This problem is not with the network driver by default (rtl8139), so I
think that should be something related to Virtio.

Thanks in advance for your reply.

Regards,
Daniel
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