On Wed, May 07, 2014 at 03:14:01PM -0700, Ryan Wilson wrote:
> The upcall hander keeps a hash table which hashes flow to a list of
> corresponding packets. This used to be necessary as packets with the same flow
> had similar actions and calculating actions used to be a performance 
> bottleneck.
> Now that userspace action calculation performance has improved, there is no 
> need
> for this hash map.
> 
> This patch removes this hash map and each packet has its own upcall.
> 
> Signed-off-by: Ryan Wilson <wr...@nicira.com>

Hmm.  Do we have performance numbers to back this up?  Ethan, I assume
that you suggested this project; do you have additional rationale?
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