This patch adds an AVX2 vectorized path to the i40e driver, based on the existing SSE4.2 version. Using AVX2 instructions gives better performance than the SSE version, though the percentage increase depends on the exact settings used. For example:
* Using 16B rather than 32B descriptors gives the biggest benefit since 2 descriptors at a time can be read, rather than just 1 when 32B ones are used. * Bigger burst sizes for RX gives improved performance - while we see an improvement with testpmd with the default burst size of 32, burst sizes of up to 128 give further improvements * In my testing, most of the improvement comes from faster processing on the RX path, though the improved TX also gives benefit. This has been tested on a system with CPU: "Intel(R) Xeon(R) Gold 6154 CPU @ 3.00GHz", and I've focused on testing with Rx ring sizes of approx 1k - generally --rxd=1024 and --txd=512, rather than the defaults which tend to give poorer zero-loss performance due to the smaller amount of buffering. Bruce Richardson (2): net/i40e: add AVX2 Tx function net/i40e: add AVX2 Rx function drivers/net/i40e/Makefile | 19 + drivers/net/i40e/i40e_rxtx.c | 31 ++ drivers/net/i40e/i40e_rxtx.h | 6 + drivers/net/i40e/i40e_rxtx_vec_avx2.c | 792 ++++++++++++++++++++++++++++++++++ 4 files changed, 848 insertions(+) create mode 100644 drivers/net/i40e/i40e_rxtx_vec_avx2.c -- 2.13.6
