[openib-general] Minor question on fat tree routing

[Yevgeny Kliteynik]

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.

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