[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 #19 from Vincenzo Maffione <vmaffione at FreeBSD.org> ---
(In reply to Sylvain Galliano from comment #16)

Thanks a lot.
In the XL710 case, have you tried with lower values of the timer, such as 50us
down to 5 us?
Is there any visible change?

Also, have you looked at pkt-gen CPU utilization? That's something that tells
you if you are CPU limited (unlikely) or rather still limited by the
"pseudo-interrupt rate" being too low.
For, instance, how does pkt-gen CPU utilization look in the case of XL710 and 1
queue (for simplicity, so that you have just a single thread)?

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