[Bug 248652] netmap: pkt-gen TX huge pps 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 #13 from Vincenzo Maffione <vmaffione at FreeBSD.org> ---
(In reply to vistalba from comment #12)
I started to work on it, however I've no suitable hardware to test.

This means that I will need to patch qemu to modify the emulation of an
iflib-backed device with MSI-X interrupts (such as vmxnet3) in such a way that
I can reproduce the problem (e.g. by making the transmission asynchronous w.r.t
the register write that triggers it, like in real hardware).

I will for sure ask for tests on real hardware, but first I need to make some
basic experiments on my own.

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