On Mon, Apr 02, 2012 at 05:15:55PM +0100, Tim Hughes wrote:
Hello,
We have been tuning our libvirt hosts and discovered that setting the txqueuelen on vnetX devices to 2500 we can increase the network throughput by a factor of almost 10. On an eth device it can be set by hand/rc.local with the following instructions http://www.cyberciti.biz/faq/gentoo-centos-rhel-debian-fedora-increasing-txq... . Because vnetX devices are named on a 'first free' basis and they come and go with the guests the rc.local method is not going to work. I think this needs to be done via libvirt or possibly udev, maybe with some kind of hook. Ideally I would like to be able to set this automatically for all vnetX devices when they are created or even better, on a per guest basis.
You can probably do this with a hook script: http://libvirt.org/hooks.html Please also file a BZ requesting that this tunable be directly supported by libvirt. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|