[ovs-dev] [PATCH ovn v3 07/10] ovn: Add tunnel_key concept to Bindings table, assign in ovn-northd.

Justin Pettit jpettit at nicira.com
Wed Apr 29 16:22:48 UTC 2015


> On Apr 29, 2015, at 6:34 AM, Russell Bryant <rbryant at redhat.com> wrote:
> 
> I wonder how realistic it would be to have 65k ports and hit this as a
> limit.  If your deployment has many containers in each VM, it seems like
> we could hit that much more quickly than traditionally seen before.

I had the same thought around containers.  I think we need to assume we'll hit 65k ports in the whole system pretty quickly.

> If a protocol can fit a whole UUID in tunneled packets, I suppose we
> could optionally switch to using the logical port UUID later?

The whole UUID seems like a lot of overhead.  I'll start a new thread to discuss how we want to handle end-point identification.  If we did a schema like use a 24-bit logical network id and a 16-bit logical port number that should scale fine.  Even if we do a good job with broadcast suppression, 65k ports in a subnet is still probably pushing practical limits.

I'll get that new thread started.

--Justin





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