[libvirt] is it possible to set txqueuelen on vnetX devices automatically

[Tim Hughes]

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 <thughes at 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:thughes at thegoldfish.org
>
>
>
>
>
> On 2 April 2012 17:22, Daniel P. Berrange <berrange at 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-
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>> |: http://libvirt.org              -o-
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>>
>
>
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