[openib-general] [PATCH/RFC] IB/ipoib: add selective tx signaling

[Moni Shoua]

> Unless you can come up with a way that makes sure that all skbs are
> completed even in low-traffic situations, I don't think this is
> mergeable -- it's just too much of a usability nightmare to have a
> flag that is essentially "break some workloads in a mysterious way to
> make some benchmarks run a little faster."

Thanks for the comment.
My thinking on how to address this issue is: add a periodic task that 
checks if there are uncompleted sends beyond some threshold. If there 
are such, it sets a flag that causes the ipoib tx logic to enforce a 
signal on the next post and sends a packet which is practically a 
NO-OP.

This packet can be for example a unicast arp (reply) with src and dst 
being this interface IP.