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 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 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
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 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
