[dpdk-dev] [PATCH v2 0/4] rte_hash_crc reworked to be platform-independent

Yerden Zhumabekov e_zhumabekov at sts.kz
Sun Nov 16 18:59:16 CET 2014

This is a rework of my previous patches improving performance of rte_hash_crc. In addition, this revision brings a fallback mechanism to ensure that CRC32 hash is calculated regardless of hardware support from CPU (i.e. SSE4.2 intrinsics).

Summary of changes:
* added CRC32 software implementation, which is used as a fallback in case SSE4.2 is not available, or if SSE4.2 is intentionally disabled.
* added rte_hash_crc_set_alg() function to control availability of SSE4.2.
* added rte_hash_crc_8byte() function to calculate CRC32 on 8-byte operand.
* reworked rte_hash_crc() function which leverages both versions of CRC32 hash calculation functions with 4 and 8-byte operands.

Patches were tested on machines either with and without SSE4.2 support. Software implementation seems to be about 15 times slower than SSE4.2-enabled one. Of course, they return identical results.

Yerden Zhumabekov (4):
  hash: add software CRC32 implementation
  hash: add new rte_hash_crc_8byte call
  hash: add fallback to software CRC32 implementation
  hash: rte_hash_crc() slices data into 8-byte pieces

 lib/librte_hash/rte_hash_crc.h |  212 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 202 insertions(+), 10 deletions(-)


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