[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 #36 from Vincenzo Maffione <vmaffione at FreeBSD.org> ---
(In reply to Vincenzo Maffione from comment #35)
I would ask for advice from the Intel guys here...
I'm trying to compare stable/11 vs current, regarding how TX interrupts are
handled. It looks like in stable/11 MSI-x handlers are shared for the TX and RX
queue, while in current TX interrupts are not used.
Also, in stable/11 the interrupt handler seems to do a disable_queue and then
enable_queue, while on current I only see the enable_queue step
(IFDI_TX_QUEUE_INTR_ENABLE).

Therefore, in the last patch I also add the enable_queue step in the netmap
timer routine. It may be worth giving a try to see if this fixes the ixl issue.

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