Hi! Increasing MTU on interfaces would allow to make use of jumbo frames which should improve the performance. Here [1] you can find what configuration options you have to change to use jumbo frames.
Hope this helps. Thanks, Elena [1] https://chruz.wordpress.com/2015/10/09/configuring-openstack-to-use-jumbo-frames-mtu-9000/ On Tue, Dec 15, 2015 at 12:34 AM, Gustavo Randich <[email protected] > wrote: > Hi, > > Scenario: Kilo / VXLAN / DVR > > Networking installation documentation mentions that when using tunneling > protocols, ideally, we could use jumbo frames on the physical network, but > then describes a "conservative" approach which is to decrease the MTU size > of the guests' interfaces (i.e. to 1454), using DHCP. > > In my current installation, which is the 'conservative' one (guest > MTU=1454, host MTU=1500) , I'm getting these approximate iperf rates: > > tenant network, guest to guest same host = 9.5 GB/sec > tenant network, guest to guest different host = 1.4 GB/sec > > > My questions are: > > - Should there be any performance gains if I opt for guest MTU = 1500, > and physical/host MTU = 1550 / 1600 / 9000? > > - Which Neutron / ML2 plugin configuration parameters should I modify > (in addition to changing physical interfaces' MTU), in order to specify an > MTU greater than 1500 in the physical network that contains my tenant > networks? > > - Anyone knows of a Neutron installation procedure or guide covering > the jumbo frames approach? > > > Thanks! > > > _______________________________________________ > OpenStack-operators mailing list > [email protected] > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators > >
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