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Comment by oasisbob | Hacker News Reader

Isn't TSO enabled on EC2? Their bulletin implies it at least, I seem to remember the same.

Enabled on Azure Ubuntu, FWIW:

  $ ethtool -k eth0 | grep tcp-seg
  tcp-segmentation-offload: on

It may well be, I don't use EC2 much at all. Checking is easy enough: ~$ ethtool -k ethX

Also on the virtualization side, VMWare VMXNet adapters also support offloading for guests.