Hey Nikhil,
A few things to consider.
- Nox is *not* a very efficient controller. The event model using
argument binding and function pointers adds a lot of overhead, and
significant time is wasted checking fd's which don't have any events
pending. There are other scalability limitations as the number of
active OpenFlow connections increases over a few hundred. If you want
to test against a more efficient controller, the trivial C controller
shipped with the reference solution and Open vSwitch is probably your
best bet.
- Both event processing latency, and throughput are useful metrics for
an OpenFlow controller. Latency provides and indication of how fast a
controller can respond to a single event. And throughput is useful to
understand how the controller handles load. Amin Tootoonchian has done
some pretty interesting latency work with Nox in which he was able to
get something like 17us end-to-end latency using a tickless kernel with
high-fidelity timers. Throughput with Nox is definitely CPU limited and
can only be test with multiple active OpenFlow connections.
- Single instance throughput is probably not a very interesting metric
for most real deployment environments. Latency, and the ability for the
controller to scale-out are more germane measurements. Testing the
latter is difficult because it converges on the consistency overhead of
the control logic implemented using the controller, and not the
controller platform itself.
.martin
Hi,
I'm looking for a way to do an apples-to-apples comparison of the
performance of various controllers out there. From what I have heard
NOX is a very efficient controller with some impressive performance
numbers.
Are there standard benchmark tools that are used to evaluate the
performance of NOX? If so, are they publicly available?
Thanks,
Nikhil
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