*** This bug is a duplicate of bug 1317811 ***
    https://bugs.launchpad.net/bugs/1317811

We finally have a way to reproduce this at will. It turns out that any kernel 
newer than 3.7 (which has the change to handle compound pages that I mentioned 
in comment #7) will suffer from this problem. The work-around that Brian found 
in the previous comment will indeed work as it prevents the use of of fragments 
(A "ethtool -K eth0 sg off" should be enough).
I will mark this bug as a duplicate of the newer one since that already has 
more detail info.

** This bug has been marked a duplicate of bug 1317811
   Dropped packets on EC2, "xen_netfront: xennet: skb rides the rocket: x slots"

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https://bugs.launchpad.net/bugs/1195474

Title:
  xennet driver reports "skb rides the rocket" under moderate load

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