[dpdk-dev] [PATCH 0/2] rewritten rte_hash_crc() call

[Yerden Zhumabekov]

As SSE4.2 provides CRC32 instructions with either 32 and 64 bit operands,
new rte_hash_crc_8byte() call assisted with _mm_crc32_u64 intrinsic may be
useful.

Then, rte_hash_crc() function is redesigned to take advantage of both 32
and 64 bit operands. This improves the function's performance significantly.

Results of my test run on a single CPU core are below.

CPU: Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
Number of iterations/chunks: 52428800
Chunk size: 24
  rte_hash_crc:            0.379 sec, hash: 0x14c64e11
  rte_hash_crc_new:        0.253 sec, hash: 0x14c64e11
Chunk size: 25
  rte_hash_crc:            0.442 sec, hash: 0xa9afc779
  rte_hash_crc_new:        0.316 sec, hash: 0xa9afc779
Chunk size: 26
  rte_hash_crc:            0.442 sec, hash: 0x92f2284b
  rte_hash_crc_new:        0.316 sec, hash: 0x92f2284b
Chunk size: 27
  rte_hash_crc:            0.442 sec, hash: 0x7c4655ff
  rte_hash_crc_new:        0.316 sec, hash: 0x7c4655ff
Chunk size: 28
  rte_hash_crc:            0.442 sec, hash: 0xf577c6b4
  rte_hash_crc_new:        0.316 sec, hash: 0xf577c6b4
Chunk size: 29
  rte_hash_crc:            0.505 sec, hash: 0x6e18ba55
  rte_hash_crc_new:        0.337 sec, hash: 0x6e18ba55
Chunk size: 30
  rte_hash_crc:            0.505 sec, hash: 0x35f07dbb
  rte_hash_crc_new:        0.337 sec, hash: 0x35f07dbb
Chunk size: 31
  rte_hash_crc:            0.505 sec, hash: 0x1bf2ee8c
  rte_hash_crc_new:        0.337 sec, hash: 0x1bf2ee8c

Yerden Zhumabekov (2):
  hash: add new rte_hash_crc_8byte call
  hash: rte_hash_crc uses 8- and 4-byte CRC32 intrinsics

 lib/librte_hash/rte_hash_crc.h |   47 +++++++++++++++++++++++++++++++++-------
 1 file changed, 39 insertions(+), 8 deletions(-)

-- 
1.7.9.5