On Mon, 28 Sep 2015, Jason Gunthorpe wrote:

> I think your original idea of broadcast immediately and deferred
> optimal mlid lookup is the best *functionally* for every case - only
> when you enter the very edge world of caring about timing does it make
> any difference.

Infiniband is about the edge.

> Christoph's needs would probably be better served by giving some API
> to control the mlid cache (ie the neightbour table is already 99% of
> the way there). This would let some userspace component pre-load and
> fix all relevant data and undesired cache activity simply can't add
> jitter.

Ok so on boot up we preload 3000 multicast groups into the neighbor table?
What impact on IB performance would having such a number of mlid's in the
cache have?

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