[dpdk-dev] [PATCH 0/2] AVX2 Vectorized Rx/Tx functions for i40e

[Bruce Richardson]

On Thu, Nov 23, 2017 at 04:53:12PM +0000, Bruce Richardson wrote:
> 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
> 
Just also to note that this set has quite a number of checkpatch
warnings about long lines. These were deliberately left in, as the lines
are not significantly over 80 characters, and I felt that splitting them
would have hurt readability.

/Bruce