[ovs-discuss] Openswitch VM to VM traffic switching

Todd Deshane deshantm at gmail.com
Wed May 19 22:52:15 UTC 2010

On Wed, May 19, 2010 at 12:02 AM, Ben Pfaff <blp at nicira.com> wrote:
> On Tue, May 18, 2010 at 10:39:15PM -0400, Todd Deshane wrote:
>> Maybe it would be useful to have a INSTALL.KVM?
>> It would be the same as INSTALL.Linux, except for at the end, a
>> description of using the custom ifup and ifdown scripts on the kvm
>> command line.
> I agree that adding an INSTALL.KVM is a good idea.  I think that we at
> Nicira have limited experience with KVM integration yet.  Is there any
> chance that you could start us off with a draft for this new file?  I'll
> gladly add it, if I have something to add.

Sure. I'll send a draft along soon.

> Instead of duplicating (most of?) INSTALL.Linux, I would rather refer to
> it.  Then, if it changes, it only has to be changed in one place.

> That's good to know.
> There are some benchmarks, of an older version of OVS, in the paper
> posted on the Documentation page at openvswitch.org.
> It's been a while since we've carefully looked at OVS numbers versus the
> Linux bridge.  If you find any big discrepancies, please let us know, so
> that we can see about fixing them.
> (Have you tried making a graph like that in the OVS paper?  I am curious
> to see whether others also see the anomalies shown in the graph at 192
> kB and 4 MB transfer sizes.)

I have a set of scripts that allow me to move from ovs to bridging
easily (I'll post more on these later).

Attached are some results.

I ran:
netpipe-tcp 3.7.1-1 (from the Ubutnu 10.04 package)
KVM guest to KVM guest on two computers hooked together by a
cross-over with gigabit NICs.
I ran the tests a few times and the numbers look very similar.
One graph is ovs and one is a standard bridge.

I'll follow up with more details and also the INSTALL.KVM draft soon.


Todd Deshane
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