> Because underlying code behaves differently based on the hop_limit
> (changes the timeout and LID values), I'd like to see the hop_limit setting at
> least take into account whether the src/dst addresses are on different
> subnets, so that it can remain 1 when routing is not in use.
>
Just wondering if it'd scale better if we start off with a known bigger default
hop limit and set it to 1 only if we know that we are _not_ going out of the
subnet ?
In any case, I'm still trying to understand how best to do what you are
suggesting i.e take into account the src/dst addresses on different subnets ,
and so far the only piece
Of code that I could find that does something close to that would be the
ib_init_ah_from_path() , in particular the snippet (and my comment )below.
Would you suggest modifying it here? Is my understanding correct or am I
missing something ?
force_grh = rdma_port_get_link_layer(device, port_num) ==
IB_LINK_LAYER_ETHERNET;
if (rec->hop_limit > 1 || force_grh) {
..
..
ah_attr->grh.hop_limit = rec->hop_limit; /* This seems to be the
key which is why I was modifying the value in cma_resolve_iboe_route() */
..
}
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