On Tue, Dec 15, 2009 at 12:15 PM, Jason Gunthorpe
<jguntho...@obsidianresearch.com> wrote:
>> > However, I don't understand the comment "Only set HopLimit if going 
>> > through a
>> > router"?
>>
>> This is from '#ifdef ROUTER_EXP' days - as far as I could understand
>> HopLimit should be set to IB_HOPLIMIT_MAX for inter-subnet MADs.
>
> If HopLimit is 0 then no GRH is required, if it is non 0 then the user

I think it is:
HopLimit 0 or 1 requires no GRH (GRH is optional in these cases)
and
other than 0 or 1 requires GRH

> of that path needs to apply a GRH. IIRC there are already a few things
> in the kernel that follow this?

Yes, we started down this path. This was all discussed on the list
back prior to SC07 days AFAIR.

-- Hal

> Jason
>
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