[ovs-discuss] Some more scaling test results...

Ryan Moats rmoats at us.ibm.com
Mon Feb 8 21:19:58 UTC 2016

Andy Zhou <azhou at ovn.org> wrote on 02/08/2016 01:54:06 PM:

> From: Andy Zhou <azhou at ovn.org>
> To: Ryan Moats/Omaha/IBM at IBMUS
> Cc: discuss at openvswitch.org
> Date: 02/08/2016 01:54 PM
> Subject: Re: [ovs-discuss] Some more scaling test results...
> On Fri, Feb 5, 2016 at 5:26 PM, Ryan Moats <rmoats at us.ibm.com> wrote:
> Today, I stood up a five node openstack cloud on machines with 56
> cores and 256GB of memory and ran a scaling test to see if I could
> stamp out 8000 copies of the following pattern in a single project
> (tenant): n1 --- r1 --- n2 (in other words, create 8000 routers,
> 16000 networks, 16000 subnets, and 32000 ports). Since both n1 and
> n2 had subnets that were configured to use DHCP, the controller has
> 16000 namespaces and dnsmasq processes. The controller was set up to
> use separate processes to handle the OVN NB DB, OVN SB DB, and
> Openvswitch DBs
> So, what happened?
> The neutron log (q-svc.log) showed zero OVS DB timeouts, which means
> that the ovsdb server process handling the NB OVN db could keep up
> with the scale test. Looking at the server at the end of the
> experiment, it was using about 70GB of memory, with the top twenty
> occupancies being:
> ovsdb-server process handling the OVN SB db at 25G
> ovsdb-server process handling the vswitch DB at 2.7G
> ovn-controller process at 879M
> each of the 17 neutron-server processes at around 825M
> (this totals up to slightly more than 42.5G)
> For those interested, the OVSDB file sizes on disk are 138M for
> ovnsb.db, 14.9M for ovnnb.db and 18.4M for conf.db
> Although I admit that this test didn't include the stress that
> putting a bunch of ports onto a single network would create, but
> still, I'm of the belief that if one uses separate ovsdb-server
> processes, then the long poles in the tent become the SB OVN
> database and the processes that are driven by it.
> Have a great weekend,
> Ryan
> Thanks for sharing.
> May I know how many connections do ovsdb-server SB host?  On a live
> system, you can find out by typing:  "ovs-appctl -t ovsdb-server

Unfortunately, the experiment has been torn down to allow others to run, so
I can no longer provide that information...

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