[dpdk-dev] [PATCH v2 0/4] DPDK memcpy optimization

Zhihong Wang zhihong.wang at intel.com
Thu Jan 29 03:38:43 CET 2015

This patch set optimizes memcpy for DPDK for both SSE and AVX platforms.
It also extends memcpy test coverage with unaligned cases and more test points.

Optimization techniques are summarized below:

1. Utilize full cache bandwidth

2. Enforce aligned stores

3. Apply load address alignment based on architecture features

4. Make load/store address available as early as possible

5. General optimization techniques like inlining, branch reducing, prefetch pattern access

Changes in v2:

1. Reduced constant test cases in app/test/test_memcpy_perf.c for fast build

2. Modified macro definition for better code readability & safety

Zhihong Wang (4):
  app/test: Disabled VTA for memcpy test in app/test/Makefile
  app/test: Removed unnecessary test cases in app/test/test_memcpy.c
  app/test: Extended test coverage in app/test/test_memcpy_perf.c
  lib/librte_eal: Optimized memcpy in arch/x86/rte_memcpy.h for both SSE
    and AVX platforms

 app/test/Makefile                                  |   6 +
 app/test/test_memcpy.c                             |  52 +-
 app/test/test_memcpy_perf.c                        | 220 ++++---
 .../common/include/arch/x86/rte_memcpy.h           | 680 +++++++++++++++------
 4 files changed, 654 insertions(+), 304 deletions(-)


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