Re: [PATCH 1/1] Initiate heavy sweep in MFTSubnSet fails during idle time process

[Alex Netes <alexne-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>]

Hi Hal,

On 10:43 Sat 14 May     , Hal Rosenstock wrote:
> Hi Alex,
> 
> On 5/12/2011 12:14 PM, Alex Netes wrote:
> > MFTSubnSet failed MADs may leave temporary MC loops in the fabric.
> > In order to eliminate this faulty state as quick as possible it's a good
> > thing to initiate a heavy sweep immediately and to wait for the next light
> > sweep.
> > 
> > Signed-off-by: Alex Netes <alexne-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> > ---
> >  opensm/osm_state_mgr.c |    7 +++++++
> >  1 files changed, 7 insertions(+), 0 deletions(-)
> > 
> > diff --git a/opensm/osm_state_mgr.c b/opensm/osm_state_mgr.c
> > index dd308f2..aa71b03 100644
> > --- a/opensm/osm_state_mgr.c
> > +++ b/opensm/osm_state_mgr.c
> > @@ -1434,6 +1434,13 @@ static void do_process_mgrp_queue(osm_sm_t * sm)
> >  		osm_mcast_mgr_process(sm);
> >  		wait_for_pending_transactions(&sm->p_subn->p_osm->stats);
> >  	}
> > +
> > +	/* if one or more MFTSubnSet MADs fails
> > +	 * during idle process time initiate heavy sweep */
> > +	if (sm->p_subn->force_heavy_sweep
> > +	    || sm->p_subn->subnet_initialization_error)
> > +		osm_sm_signal(sm, OSM_SIGNAL_SWEEP);
> 
> subnet_initialization_error is more than just set MFT failures. Should
> it be narrowed down to just those failures ?
> 

Do you mean, just resend the MFTs without causing heavy sweep?

> Also, while this looks like it would fix the scenario you mention,
> couldn't this change cause a continual heavy sweep ?
> 

Yes. This can cause continual heavy sweep. But this would happen anyway. This
patch initiate heavy sweep immediately and without it, the heavy sweep would be
started on the next light sweep. In both cases you can end up in heavy sweep
loop.
> -- Hal
> 
> > +
> >  }
> >  
> >  void osm_state_mgr_process(IN osm_sm_t * sm, IN osm_signal_t signal)
> 
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-- 

-- Alex
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