It looks like you set the 'EnaSupport' attribute, and if I boot an m4.16xlarge instance I get an ENA network device. But on the smaller instances like m4.4xlarge it's falling back to PV netback instead of using the Intel SR-IOV.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking.html https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/sriov-networking.html
Metadata Update from @davdunc: - Issue assigned to davdunc
Metadata Update from @davdunc: - Issue tagged with: AWS
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