Preliminary AWS ENA Benchmark Results on DPDK

[fwefew 4t4tg <7532yahoo@gmail.com>]

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https://github.com/rodgarrison/reinvent#benchmarks

I show two c5n.metal boxes with AWS ENA NICs running under DPDK in the same
data center running 1 TXQ and 1 RXQ transceiving 72-byte UDP packets
(32-byte payload):

- transmit around 874,410 packets/sec/queue

If the NIC's TXQ ring is not full the application code can hand off packets
to the NICs output buffer as fast as 415 ns/pkt or  some 2.4 million
packets/sec. But once the TXQ ring or HW buffers get full, throughput drops
about 3x. I will update the link shortly with the RX states. In short,
performance seems decent except when rings are full.

But since AWS ENA NICs are virtual --- they are not a bonafide NIC card
plugged into the computer's PCI bus, I'm not sure if these numbers are
good, average, or suck. Indeed as per:

https://www.amazon.com/Data-Plane-Development-Kit-DPDK/dp/0367373955/ref=sr_1_1?keywords=data+plane+development+kit&qid=1648425589&s=books&sprefix=data+plane+devel%2Cstripbooks%2C85&sr=1-1

chapter 12 (virtio) page 236 virtio is at least partially interrupt driven.
I had no idea of the details but interrupt driven surely has to under
perform a vanilla case where the CPU/NIC/PCI work in unison without all the
virtualization technology. I'm not even sure, by extension, whether the ENA
driver is really 100% poll-driven.

Any context/feedback here would be appreciated.

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