ENA network performance looks fine in linux-aws 4.4.0-1005.14:

client: m4.16xlarge // ens3: ena 1.1.2 // 4.4.0-1005-aws #14-Ubuntu
server: m4.16xlarge // ens3: ena 1.1.2 // 4.4.0-1005-aws #14-Ubuntu
 $ nuttcp -i10 -T30 -N5  ip-172-31-39-115
22699.6250 MB /  10.00 sec = 19041.4866 Mbps
23769.0000 MB /  10.00 sec = 19939.0977 Mbps
23597.8125 MB /  10.00 sec = 19795.2779 Mbps

70098.7500 MB /  30.01 sec = 19594.4566 Mbps 75 %TX 97 %RX 0.25 msRTT

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https://bugs.launchpad.net/bugs/1664312

Title:
  Update ENA driver to 1.1.2 from net-next

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