[dpdk-dev] [PATCH] Implement rte_memcmp with AVX/SSE instructions.

[Ravi Kerur <rkerur@gmail.com>]

Background:
After preliminary discussion with John (Zhihong) and Tim from Intel it was
decided that it would be beneficial to use AVX/SSE instructions for memcmp
similar to memcpy being implemeneted. In addition, we decided to use
librte_hash as a test candidate to test both functionality and performance.

Currently memcmp in librte_hash is used for key comparisons whose length
can vary and max key length is defined to 64 bytes. Similarly strncmp
is used to compare names whose max lengh is 32 bytes. When memcmp and
strncmp is replaced with rte_memcmp test results show minor improvements in
"hash_perf" tests with a decrease of "1s" out of total "1m 3s" run time.
Similarly when key_length is increased to 128 bytes, "hash_perf" shows decrease
of "4s" out of total "1m 49s" run time with rte_memcmp.

Test was conducted on Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz, Ubuntu
14.04, x86_64, 16GB DDR3 system.

Plan is to engage the team and get feedback to further improvise performace.

Ravi Kerur (1):
  Implement memcmp using AVX/SSE instructio

 app/test/test_hash.c                               |   2 +-
 app/test/test_hash_perf.c                          | 302 +++++++------
 .../common/include/arch/ppc_64/rte_memcmp.h        |  62 +++
 .../common/include/arch/x86/rte_memcmp.h           | 479 +++++++++++++++++++++
 lib/librte_eal/common/include/generic/rte_memcmp.h | 119 +++++
 lib/librte_hash/rte_fbk_hash.c                     |   7 +-
 lib/librte_hash/rte_hash.c                         |  15 +-
 lib/librte_hash/rte_hash.h                         |   2 +-
 8 files changed, 857 insertions(+), 131 deletions(-)
 create mode 100644 lib/librte_eal/common/include/arch/ppc_64/rte_memcmp.h
 create mode 100644 lib/librte_eal/common/include/arch/x86/rte_memcmp.h
 create mode 100644 lib/librte_eal/common/include/generic/rte_memcmp.h

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1.9.1