[ovs-dev] [PATCH v3] Scanning only changed entries in the ovnsb

[Ben Pfaff]

On Tue, Jul 26, 2016 at 03:44:57PM -0400, Hui Kang wrote:
> 
> 
> "dev" <dev-bounces at openvswitch.org> wrote on 07/26/2016 02:20:27 PM:
> 
> > From: Ben Pfaff <blp at ovn.org>
> > To: Hui Kang <hkang.sunysb at gmail.com>
> > Cc: dev at openvswitch.org
> > Date: 07/26/2016 02:20 PM
> > Subject: Re: [ovs-dev] [PATCH v3] Scanning only changed entries in the
> ovnsb
> > Sent by: "dev" <dev-bounces at openvswitch.org>
> >
> > On Sat, Jul 16, 2016 at 11:58:25PM -0400, Hui Kang wrote:
> > > Improve performance by scanning only changed port binding entries
> > > when determining whether to mark the logical switch port up or
> > > down
> > >
> > > Signed-off-by: Hui Kang <kangh at us.ibm.com>
> >
> > Won't this skip an initial round of updates at ovn-northd startup time?
> > (Certainly ovn-northd might get killed and restarted occasionally,
> > especially if we're doing failover to a second host.)
> 
> Hi, Ben,
> After second thought, I think skipping the initial round is the purpose of
> this patch.
> 
> ovsdb_idl_create(ovsdb) copies the the Port_binding table from southbound
> database whenever ovn-northd gets started. In this case, the northbound
> DB and southbound db are synced. 

I don't understand this statement.  ovsdb_idl_create() doesn't sync
anything between nb and sb dbs.