On Wed, 2006-03-01 at 23:10, Fabian Tillier wrote: > On 3/1/06, Sean Hefty <[EMAIL PROTECTED]> wrote: > > Can someone explain when ipoib creates a multicast group? > > Here's how the Linux IPoIB handles multicast: > > For the broadcast group, it depends on the SM having pre-created the > broadcast group. It only does a join (i.e. component mask doesn't > provide all the settings to create the group) for the broadcast group. > > Once in the broadcast group, it uses it as a template for all other > groups, which allows it to issue a join with all paramters necessary > to create the group if it doesn't exist already.
That's what the IPoIB I-D says. > I believe the only field that changes is the MGID. > > Since all IPoIB instances in the fabric use the same broadcast group, > their settings for all MC groups are consistent, no matter which > instance creates particular groups. This is on a per partition basis (one broadcast group per partition assuming IPoIB is running on that partition). -- Hal > In Windows, only the broadcast group join is different. In this case, > the code handles the case where the broadcast group is not > pre-created, and the first instance to start will create it. In that > case, it picks some values for the broadcast group, mostly hardcoded > except for the qkey which it generates dynamically. Once in the > broadcast group, it uses it as a template for all other MC groups. > > - Fab > _______________________________________________ > openib-general mailing list > [email protected] > http://openib.org/mailman/listinfo/openib-general > > To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
