[dpdk-dev] [PATCH 0/4] Optimize memcpy for AVX512 platforms

Zhihong Wang zhihong.wang at intel.com
Thu Jan 14 07:13:18 CET 2016

This patch set optimizes DPDK memcpy for AVX512 platforms, to make full
utilization of hardware resources and deliver high performance.

In current DPDK, memcpy holds a large proportion of execution time in
libs like Vhost, especially for large packets, and this patch can bring
considerable benefits.

The implementation is based on the current DPDK memcpy framework, some
background introduction can be found in these threads:

Code changes are:

  1. Read CPUID to check if AVX512 is supported by CPU

  2. Predefine AVX512 macro if AVX512 is enabled by compiler

  3. Implement AVX512 memcpy and choose the right implementation based on
     predefined macros

  4. Decide alignment unit for memcpy perf test based on predefined macros

Zhihong Wang (4):
  lib/librte_eal: Identify AVX512 CPU flag
  mk: Predefine AVX512 macro for compiler
  lib/librte_eal: Optimize memcpy for AVX512 platforms
  app/test: Adjust alignment unit for memcpy perf test

 app/test/test_memcpy_perf.c                        |   6 +
 .../common/include/arch/x86/rte_cpuflags.h         |   2 +
 .../common/include/arch/x86/rte_memcpy.h           | 247 ++++++++++++++++++++-
 mk/rte.cpuflags.mk                                 |   4 +
 4 files changed, 255 insertions(+), 4 deletions(-)


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