On Thu, 2015-01-15 at 15:58 +0100, Thomas Jarosch wrote:

A colleague mentioned to me he saw the "Hardware Unit Hang" message every 
few days even running on kernel 3.4 (without your patch). Basically I'm 
testing now if that's still the case with 3.19-rc4+ or not.

I'm all for fixing the root cause. I'm just interested if the e1000e
hang can even be triggered when using a max frag page size of 4096.
So far it transferred 751.6 GiB without a hiccup.

You told it was forwarding setup.

1) What is the NIC receiving traffic.
2) What happens if you disable GRO on it ?