[dpdk-dev] [PATCH v1 1/2] distributor lib performance enhancements

David Hunt david.hunt at intel.com
Thu Dec 1 05:50:19 CET 2016


This patch aims to improve the throughput of the distributor library.

It uses a similar handshake mechanism to the previous version of
the library, in that bits are used to indicate when packets are ready
to be sent to a worker and ready to be returned from a worker. One main
difference is that instead of sending one packet in a cache line, it makes
use of the 7 free spaces in the same cache line in order to send up to
8 packets at a time to/from a worker.

The flow matching algorithm has had significant re-work, and now keeps an
array of inflight flows and an array of backlog flows, and matches incoming
flows to the inflight/backlog flows of all workers so that flow pinning to
workers can be maintained.

Notes:
   Apps must now work in bursts, as up to 8 are given to a worker at a time
   For performance in matching, Flow ID's are 15-bits
   Original API (and code) is kept for backward compatibility

Performance Gains
   2.2GHz Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz
   2 x XL710 40GbE NICS to 2 x 40Gbps traffic generator channels 64b packets
   separate cores for rx, tx, distributor
    1 worker  - 4.8x
    4 workers - 2.9x
    8 workers - 1.8x
   12 workers - 2.1x
   16 workers - 1.8x


[PATCH v1 1/2] lib: distributor performance enhancements
[PATCH v1 2/2] example: distributor app modified to use burstAPI


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