> On Aug 3, 2016, at 6:48 PM, Wilence Yao <wilence....@gmail.com> wrote:
>
> Hi,
> I'm studying OVN these days. I found that ovn-controller issue too match flow
> table to br-int in compute node. Number of flows it too large。
>
> The question is that those flow tables may reduce efficiency of flow match in
> packet forwarding.
>
> I have heard that efficiency reduce heavily when number of flows more than
> 20000 in kernal.
> Has any one make stress testing of packet forwarding in ovn environment,
> especially several vms on one hypervisor.
You can't really extrapolate how many kernel flows there will be based on the
number of OpenFlow flows that OVN pushes to OVS. The kernel flows are a cache
of compressed flow entries based on the traffic that's actively being seen as
well as the OpenFlow flows that have been configured. I would expect there to
be orders of magnitude fewer kernel flows than OpenFlow flows. We wrote an
academic paper on how we generate those flow cache entries if you're interested:
http://openvswitch.org/support/papers/nsdi2015.pdf
If you haven't done so, I'd recommend setting up OVN and looking for yourself.
--Justin
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