[Qemu-devel] virtio-net crashes vs. old napi patch

[Peter Lieven]

Hi,

as reported several times guests with virtio-net crash under heavy network load.
There have been several patches submitted to the upstream kernel e.g:

virtio_net: do not reschedule rx refill forever
virtio_net: fix oom handling on tx
udp/tcp/..: use limited socket backlog

but that did not finally solved the problem. Is is at
least possible to crash a recent 2.6.38 kernel very
easily.

There is currently a discussion going on on launchpad:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/579276

I found out earlier that an old patch by Suse developers
seems to fix the problem for good:
http://kerneltrap.org/mailarchive/linux-netdev/2010/6/4/6278660

and recently tests seem to confirm this.

Does anyone know why this patch did not went upstream or was it
overseen?

Peter