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

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

--- Comment #33 from Sylvain Galliano <sg at efficientip.com> ---
(In reply to Vincenzo Maffione from comment #32)

Here are the results:

ixl only patch, 6 queues, pkt-get WITHOUT -R:
710.623764 main_thread [2642] 38.621 Mpps (38.698 Mpkts 18.538 Gbps in 1002000
usec) 512.00 avg_batch 99999 min_space

ixl only patch, 1 queue, pkt-get WITHOUT -R:

670.168017 main_thread [2642] 0.000 pps (0.000 pkts 0.000 bps in 1009185 usec)
0.00 avg_batch 99999 min_space
671.181833 main_thread [2642] 0.000 pps (0.000 pkts 0.000 bps in 1013816 usec)
0.00 avg_batch 99999 min_space
672.171832 sender_body [1662] poll error on queue 0: timeout
672.171838 sender_body [1665] txring 513 513 513
672.191833 main_thread [2642] 0.000 pps (0.000 pkts 0.000 bps in 1010000 usec)
0.00 avg_batch 99999 min_space

ixl only patch, 1 queue, pkt-get WITH -R:

-R 1000:
813.372070 main_thread [2642] 1.001 Kpps (1.002 Kpkts 480.718 Kbps in 1000503
usec) 3.00 avg_batch 99999 min_space
-R 2000:
860.807010 main_thread [2642] 2.006 Kpps (2.010 Kpkts 962.692 Kbps in 1002190
usec) 6.00 avg_batch 99999 min_space
...
(all intermediate -R value worked)
...
-R 17000000:
057.160242 main_thread [2642] 17.001 Mpps (18.072 Mpkts 8.160 Gbps in 1063000
usec) 512.00 avg_batch 99999 min_space
-R 18000000:
030.167994 sender_body [1662] poll error on queue 0: timeout
030.168001 sender_body [1665] txring 513 513 513



ixl + timer patches, 1 queue, pkt-get WITH -R:
sysctl nm_tx_tmr_us=5

-R 1000:
261.886507 main_thread [2642] 1.001 Kpps (1.065 Kpkts 480.679 Kbps in 1063496
usec) 3.00 avg_batch 99999 min_space
-R 2000:
279.365024 main_thread [2642] 2.000 Kpps (2.034 Kpkts 960.219 Kbps in 1016768
usec) 6.00 avg_batch 99999 min_space
...
(all intermediate -R value worked)
...
-R 17000000
388.372451 main_thread [2642] 17.000 Mpps (18.079 Mpkts 8.160 Gbps in 1063431
usec) 512.00 avg_batch 99999 min_space
-R 18000000
894.421917 main_thread [2642] 18.000 Mpps (18.036 Mpkts 8.640 Gbps in 1002001
usec) 512.00 avg_batch 99999 min_space
and sometime an error
-R 19000000
991.012912 sender_body [1662] poll error on queue 0: timeout
991.012920 sender_body [1665] txring 513 513 513

another run:
968.011919 sender_body [1662] poll error on queue 0: timeout
968.011926 sender_body [1665] txring 235 235 235

and another one:
112.008840 sender_body [1662] poll error on queue 0: timeout
112.008848 sender_body [1665] txring 95 95 95

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