netdev - Re: Re: [bisected regression] e1000e: "Detected Hardware Unit Hang"

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Date:	Thu, 15 Jan 2015 07:25:32 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Jarosch <thomas.jarosch@...ra2net.com>
Cc:	'Linux Netdev List' <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	e1000-devel <e1000-devel@...ts.sourceforge.net>
Subject: Re: Re: [bisected regression] e1000e: "Detected Hardware Unit Hang"

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 ?


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