From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: Re: [bisected regression] e1000e: "Detected Hardware Unit Hang"
Date: Thu, 15 Jan 2015 07:25:32 -0800
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Cc: 'Linux Netdev List' <netdev@vger.kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
	e1000-devel <e1000-devel@lists.sourceforge.net>
To: Thomas Jarosch <thomas.jarosch@intra2net.com>
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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 ?