On Tue, Oct 04, 2016 at 05:11:37PM -0500, Ryan Moats wrote:
> Ben Pfaff <b...@ovn.org> wrote on 10/04/2016 12:14:32 PM:
> 
> > From: Ben Pfaff <b...@ovn.org>
> > To: Ryan Moats/Omaha/IBM@IBMUS
> > Cc: dev@openvswitch.org
> > Date: 10/04/2016 12:14 PM
> > Subject: Re: [ovs-dev,v2,2/4] ovn-controller: add quiet mode
> >
> > On Wed, Aug 31, 2016 at 03:22:44PM +0000, Ryan Moats wrote:
> > > As discussed in [1], what the incremental processing code
> > > actually accomplished was that the ovn-controller would
> > > be "quiet" and not burn CPU when things weren't changing.
> > > This patch set recreates this state by calculating whether
> > > changes have occured that would require a full calculation
> > > to be performed.  It does this by persisting a copy of
> > > the localvif_to_ofport and tunnel information in the
> > > controller module, rather than in the physical.c module
> > > as was the case with previous commits.
> > >
> > > [1] http://openvswitch.org/pipermail/dev/2016-August/078272.html
> > >
> > > Signed-off-by: Ryan Moats <rmo...@us.ibm.com>
> >
> > Hi Ryan.
> >
> > I like the idea behind this patch.  However, it no longer applies to
> > master, so it needs a rebase.
> 
> So done, but before submitting a new patch....
> 
> >
> > It also seems like this TODO should be addressed:
> > +        /* TODO (regXboi): this next line is needed for the 3 HVs, 3 LS,
> > +         * 3 lports/LS, 1 LR test case, but has the potential side
> effect
> > +         * of defeating quiet mode once a logical router leads to
> creating
> > +         * patch ports. Need to understand the failure mode better and
> > +         * what is needed to remove this. */
> > +        force_full_process();
> 
> I've been looking at what happens here and I'm seeing some signatures
> that concern me.  The test case that fails is no longer the cited one above
> but is "2 HVs, 4 lports/HV, localnet ports" ...
> 
> What I'm seeing when I peer in is that the information populating the
> local_datapath structures doesn't appear to be consistent on each pass
> through binding_run: Looking at the ovn-controller process under hv2
> for the above test (when it passes), I'll see signatures that look
> like the following:
> 
> 2016-10-04T21:57:58.257Z|00020|physical|INFO|looking at binding record
> 3736404b-c69d-4878-8d45-81ad9be06f5f
> 2016-10-04T21:57:58.257Z|00021|physical|INFO|dp_key is 1
> 2016-10-04T21:57:58.257Z|00022|physical|INFO|looking for ofport of lp11
> (LP)
> 2016-10-04T21:57:58.257Z|00023|physical|INFO|looking for ofport of ln1
> (localnet)
> ...
> 2016-10-04T21:57:58.259Z|00034|physical|INFO|looking at binding record
> 3736404b-c69d-4878-8d45-81ad9be06f5f
> 2016-10-04T21:57:58.259Z|00035|physical|INFO|dp_key is 1
> 2016-10-04T21:57:58.259Z|00036|physical|INFO|looking for ofport of lp11
> (LP)
> 2016-10-04T21:57:58.259Z|00037|physical|INFO|looking for tunnel to hv1
> ...

This sort of oscillation seems super-weird to me.  I'd also like to
learn more.
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