> Would it make sense to batch the upcalls as well, i.e. collect them up and 
> then issue them with a single dp_netdev_output_userspace()?

Yep, Ryan is working on that.

> It would seem that starting from the newest batch and looping backwards might 
> find the batch sooner, especially if the packets of a batch arrive back to 
> back.

True.  I talked about this offline with Pravin, and we think that the
best thing is to simply limit the number of packet_batches you're
allowed to have per batch.  If it's something like 4 then it shouldn't
matter.  Does that sound reasonable?  If so I'll do it as a separate
patch.

Ethan
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