i40e - rss count lower than max cpu disabes default flow director

[TWitt4]

running quad i40e on xeon 1541 under rhel,

kernel 3.13.2-4.el6

firmware 6.01 0x800036e4 1.1861.0

driver 2.7.26

working:

ethtool -L eth0 combined 8

and setting smp_affinity for Nth queue th Nth cpu

=> native flowdirector balances 1/N traffic to each queue

(no ntuple is meant)

not working:

ethtool -L eth0 combined 7

and setting smp_affinity for 1-Nth queue the 1-Nth cpu

keeping cpu0 out of networking

=> flowdirector sends all the traffic to cpu7

this could be repeated with all other Ns, f.i. 4,6.

configuring "combined 4" will send all traffic to cpu4

...

an "ethtool -L eth0 combined 8" will restore the flow director balancing. on this system, because it has 8 cores/ linux cpu's.

what's wrong? how to make it working even with lower queue count?

best regards

Thomas

[WhyeBee_T_Intel]

Hi TWitt4, Thank you for posting in Intel Ethernet Communities. Please share what is the exact network adapter used on your system for us to better assist you, if you are using a retail Intel® network adapter, please refer to this link for the model: https://www.intel.com/content/www/us/en/support/articles/000005612/network-and-i-o/ethernet-products.html. Best Regards, Whybe T Intel Customer Support Technician Under Contract to Intel Corporation

[Daniel_D_Intel1]

Hello TWitt4, Please let us know if you still need assistance. Please provide the markings from the Ethernet adapter for continued support. If you have any questions please do not hesitate to ask. Best regards, Daniel D Intel Customer Support

[Daniel_D_Intel1]

Hello TWitt4, Please let us know if you have any other questions. Best regards, Daniel D Intel Customer Support