[openstack-dev] [neutron][kilo] - vxlan's max bandwidth

Akihiro Motoki amotoki at gmail.com
Mon Apr 18 10:50:10 UTC 2016

2016-04-18 15:58 GMT+09:00 Ihar Hrachyshka <ihrachys at redhat.com>:
> Sławek Kapłoński <slawek at kaplonski.pl> wrote:
>> Hello,
>> What MTU have You got configured on VMs? I had issue with performance on
>> vxlan network with standard MTU (1500) but when I configured Jumbo
>> frames on vms and on hosts then it was much better.
> Right. Note that custom MTU works out of the box only starting from Mitaka.
> You can find details on how to configure Neutron for Jumbo frames in the
> official docs:
> http://docs.openstack.org/mitaka/networking-guide/adv-config-mtu.html

If you want to advertise MTU using DHCP in releases before Mitaka,
you can prepare your custom dnsmasq config file like below and
set it to dhcp-agent dnsmasq_config_file config option.
You also need to set network_device_mtu config parameters appropriately.

sample dnsmasq config file:
dhcp option 26 specifies MTU.


> Ihar
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