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

--- Comment #4 from Sylvain Galliano <s...@efficientip.com> ---
You're right, interrupt rate limit pps on CURRENT + X520 NIC:

pkt-gen, no busy wait

11-stable:  27500 irq/s
CURRENT:    5500  irq/s

pkt-gen, with busy wait on CURRENT: +30000 irq/s

Regarding NIC irq tunable, the only one related to 'ix' looks good:

# sysctl hw.ix.max_interrupt_rate
hw.ix.max_interrupt_rate: 31250

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