[Bug 248652] netmap: pkt-gen TX huge pps difference between 11-STABLE and 12-STABLE/CURRENT on ix & ixl NIC

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248652

--- Comment #2 from Sylvain Galliano <sg at efficientip.com> ---
Hi Vincenzo, thanks for your quick reply.

I've disabled all offloads in both 11-STABLE and CURRENT and I got the same
results.

I did another test that may help you:

I've recompiled pkt-gen on current after adding:
 #define BUSYWAIT

Testing NIC Intel X520, 1 queue configured

default pkt-gen:
696.194470 main_thread [2641] 2.560 Mpps (2.570 Mpkts 1.229 Gbps in 1004000
usec) 
465.45 avg_batch 99999 min_space

with busywait:
733.764470 main_thread [2641] 14.881 Mpps (15.172 Mpkts 7.143 Gbps in 1019565
usec) 344.22 avg_batch 99999 min_space

14Mpps, same as 11-STABLE

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