[ovs-discuss] Tuning the switch...

Ben Pfaff blp at nicira.com
Thu Nov 20 16:45:45 UTC 2014


On Thu, Nov 20, 2014 at 10:04:48AM +0000, Krist van Besien wrote:
> - Is there a way to increase the size of the kernel module's flow table?

If you upgrade to version 2.3, the kernel flow table can generally
expand to about 200,000 flows, which is sufficient for every real case
we've run into.

> - Is there a way to limit the number of flows that can be created by a
> virtual host. Ie, set a limit on maximum number of new flows created by
> packets coming out of a particular port?

Not directly.  If you use a simple enough flow table (for example, one
that only matches on IP addresses) to match the packets coming out of a
given virtual port, though, that will naturally reduce the number of
flows that can be generated (because a small number of wildcarded
datapath flows cover all of the packets received from the port).



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