Re: [libvirt] is it possible to set txqueuelen on vnetX devices automatically
For anyone interested I have managed to get this working using a udev rule /etc/udev/rules.d/60-vnet.rules KERNEL==vnet[0-9], RUN+=/sbin/ifconfig %k txqueuelen 2500 On 2 April 2012 18:03, Tim Hughes thug...@thegoldfish.org wrote: Thankyou , I should be able to do it with the hooks. I have raised a feature request at BZ809172 Tim Hughes mailto:thug...@thegoldfish.org On 2 April 2012 17:22, Daniel P. Berrange berra...@redhat.com wrote: 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-txqueuelen/ . 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 :| -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
Re: [libvirt] is it possible to set txqueuelen on vnetX devices automatically
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-txqueuelen/ . 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 :| -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
Re: [libvirt] is it possible to set txqueuelen on vnetX devices automatically
Thankyou , I should be able to do it with the hooks. I have raised a feature request at BZ809172 Tim Hughes mailto:thug...@thegoldfish.org On 2 April 2012 17:22, Daniel P. Berrange berra...@redhat.com wrote: 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-txqueuelen/ . 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:| -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
