netdev - user space virtio-net exits with "truncating packet" error

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Date:	Thu, 14 May 2009 13:07:42 +0300 (IDT)
From:	Or Gerlitz <ogerlitz@...taire.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
cc:	Avi Kivity <avi@...hat.com>, netdev@...r.kernel.org,
	Gregory Haskins <ghaskins@...ell.com>
Subject: user space virtio-net exits with "truncating packet" error

Hi,

When running with jumbo frames (i.e set tap0 and guest nic mtu to 9k)
and using 8k sized packets with iperf, the qemu process exits with
"virtio-net truncating packet" which I see in the code of qemu/hw/virtio-net.c
:: virtio_net_receive(). This happens only when the VM is receiving, if I
send 8K packets from the VM things go fine.

I use virtio based NIC in the VM and Linux 2.6.29.1 in both the VM and the host.
Qemu is the one provided by kvm release 84 - whose sources don't point me
to a specific git tree nor a maintainer, so I hope you can help me...

thanks,

Or.

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