[dpdk-dev] [PATCH v2 0/2] AVX2 Vectorized Rx/Tx functions for i40e

Vincent JARDIN vincent.jardin at 6wind.com
Wed Jan 10 15:25:23 CET 2018


Le 10/01/2018 à 10:27, Richardson, Bruce a écrit :
>> 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.

Hi Bruce,

Then, about the next limit after this performance increase: is it the 
board/Mpps capacity/PCI bus? If so, you should see that CPU usage on 
testpmd's cores to be decreased. Can you be more explicit about it?

What's about other packet size like 66 bytes? 122 bytes? which are not 
aligned on 64 bytes.

Thank you,
   Vincent


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