[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 #21 from Sylvain Galliano <sg at efficientip.com> ---
(In reply to Vincenzo Maffione from comment #19)

result using 1 queue:

ixl1: PCI Express Bus: Speed 8.0GT/s Width x8
ixl1: netmap queues/slots: TX 1/1024, RX 1/1024

sysctl dev.ixl.0.iflib.nm_tx_tmr_us=50

194.333930 main_thread [2638] 11.896 Mpps (11.902 Mpkts 5.710 Gbps in 1000497
usec) 341.33 avg_batch 99999 min_space

pkt-gen cpu usage: 35%


sysctl dev.ixl.0.iflib.nm_tx_tmr_us=5

235.070929 main_thread [2638] 14.754 Mpps (15.543 Mpkts 7.082 Gbps in 1053521
usec) 390.14 avg_batch 99999 min_space

pkt-gen cpu usage: 56%



sysctl dev.ixl.0.iflib.nm_tx_tmr_us=1

266.392925 main_thread [2638] 14.748 Mpps (14.762 Mpkts 7.079 Gbps in 1000998
usec) 407.41 avg_batch 99999 min_space

pkt-gen cpu usage: 66%



Using 6 queues configured, max pps is 17Mpps, even when using low nm_tx_tmr_us
value (1 us)
pkt-gen cpu usage: 82%

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