> -----Original Message----- > From: John Fastabend [mailto:john.fastab...@gmail.com] > Sent: Tuesday, January 9, 2018 4:31 PM > To: Richardson, Bruce; Zhang, Qi Z; Xing, Beilei > Cc: dev@dpdk.org; Zhang, Helin; Yigit, Ferruh > Subject: Re: [dpdk-dev] [PATCH v2 0/2] AVX2 Vectorized Rx/Tx functions for > i40e > > On 01/09/2018 06:32 AM, 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: > > > > Hi Bruce, > > Just curious, can you provide some hints on percent increase in at least > some representative cases? I'm just trying to get a sense of if this is > %5, 10%, 20%, more... I know mileage will vary depending on system, setup, > configuration, etc. >
Best case conditions to test under are using testpmd as that is where any IO improvement will be most seen. As a ballpark figure though, on my system while testing testpmd with both 16B and 32B descriptors, (RX/TX ring sizes 1024/512) I saw ~15% performance increase, and sometimes quite a bit higher, e.g. when testing with 16B descriptors with larger burst sizes. As you say system, setup, config all has an impact, so YMMV... :-). /Bruce
