[openib-general] Minor question on fat tree routing

[Hal Rosenstock]

On Wed, 2006-12-20 at 10:02, Yevgeny Kliteynik wrote:
> Hi Hal,
> 
> Hal Rosenstock wrote:
> > Hi Yevgeny,
> > 
> > Minor question on fat tree routing:
> > 
> > osm_ucast_ftree.c:__osm_ftree_construct_fabric has the following code:
> > 
> >    if (__osm_ftree_fabric_perform_ranking(p_ftree) != 0)
> >    {
> >       if (__osm_ftree_fabric_get_rank(p_ftree) > FAT_TREE_MAX_RANK)
> > 
> > Should < FAT_TREE_MIN_RANK also be checked there too ? Does it fallback
> > to default routing for this case too ?
> 
> This is also checked, but as part of more earlier checks in the same function:
> FatTree routing will abort even before ranking the tree and fallback to the default
> routing if a fabric has less than 2 switches.

What about 2 or more switches but rank is 1 ? Isn't that possible too ?

-- Hal

> 
> -- Yevgeny
> > 
> > Thanks.
> > 
> > -- Hal
> > 
> > 
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