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
