[dpdk-dev] [PATCH 0/4] eal/common: introduce rte_memset and related test

Zhiyong Yang zhiyong.yang at intel.com
Mon Dec 5 09:26:23 CET 2016


DPDK code has met performance drop badly in some case when calling glibc
function memset. Reference to discussions about memset in 
http://dpdk.org/ml/archives/dev/2016-October/048628.html
It is necessary to introduce more high efficient function to fix it.
One important thing about rte_memset is that we can get clear control
on what instruction flow is used.

This patchset introduces rte_memset to bring more high efficient
implementation, and will bring obvious perf improvement, especially
for small N bytes in the most application scenarios.

Patch 1 implements rte_memset in the file rte_memset.h on IA platform
The file supports three types of instruction sets including sse & avx
(128bits), avx2(256bits) and avx512(512bits). rte_memset makes use of
vectorization and inline function to improve the perf on IA. In addition,
cache line and memory alignment are fully taken into consideration.

Patch 2 implements functional autotest to validates the function whether
to work in a right way.

Patch 3 implements performance autotest separately in cache and memory.

Patch 4 Using rte_memset instead of copy_virtio_net_hdr can bring 3%~4%
performance improvements on IA platform from virtio/vhost non-mergeable
loopback testing.

Zhiyong Yang (4):
  eal/common: introduce rte_memset on IA platform
  app/test: add functional autotest for rte_memset
  app/test: add performance autotest for rte_memset
  lib/librte_vhost: improve vhost perf using rte_memset

 app/test/Makefile                                  |   3 +
 app/test/test_memset.c                             | 158 +++++++++
 app/test/test_memset_perf.c                        | 348 +++++++++++++++++++
 doc/guides/rel_notes/release_17_02.rst             |  11 +
 .../common/include/arch/x86/rte_memset.h           | 376 +++++++++++++++++++++
 lib/librte_eal/common/include/generic/rte_memset.h |  51 +++
 lib/librte_vhost/virtio_net.c                      |  18 +-
 7 files changed, 958 insertions(+), 7 deletions(-)
 create mode 100644 app/test/test_memset.c
 create mode 100644 app/test/test_memset_perf.c
 create mode 100644 lib/librte_eal/common/include/arch/x86/rte_memset.h
 create mode 100644 lib/librte_eal/common/include/generic/rte_memset.h

-- 
2.7.4



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