This recent mainline commit might be relevant:
73d3fe6d1c6d840763ceafa9afae0aaafa18c4b5 gro: fix aggregation for skb
using frag_list
That commit notes that it fixes a regression introduced by 8a29111c7ca6
("net: gro: allow to build full sized skb"), which first appeared in
Trusty. That fix is already included in v3.13.11.11, which will be
merged into Trusty in the near future.
In the meantime, I've constructed a test PPA which supplies the Trusty
3.13.0-40.68 kernel plus that fix. Rodrigo, please try this kernel and
advise whether it affects the problem:
https://launchpad.net/~kamalmostafa/+archive/ubuntu/test-lp1391339
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https://bugs.launchpad.net/bugs/1391339
Title:
Trusty kernel inbound network performance regression when GRO is
enabled
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