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842cf6f472
On the transmit path we generate essentially the same tunnel header for every packet to a given destination. However, each packet must have the headers assembled in pieces, lookup the destination in the routing table, and lookup the flow in OVS. This avoids that extra work by caching all of the header and output path information and only rebuilding it when something actually changes. This optimization reduces CPU load on transmit by approximately 13%. Signed-off-by: Jesse Gross <jesse@nicira.com> Reviewed-by: Ben Pfaff <blp@nicira.com>