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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <6534595.xliyeOG6D7@storm>
Date:	Mon, 19 Jan 2015 17:49:58 +0100
From:	Thomas Jarosch <thomas.jarosch@...ra2net.com>
To:	Eric Dumazet <eric.dumazet@...il.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: Re: [bisected regression] e1000e: "Detected Hardware Unit Hang"

On Thursday, 15. January 2015 07:25:32 Eric Dumazet wrote:
> 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 ?

one more interesting thing happened: On one production machine,
again an Intel DH61CR board, the issue was triggered even with TSO disabled.
My colleague tried to disable GRO + GSO on the e1000e adapter, too,
though not on the other interfaces.

It's strange the issue appears with TSO disabled,
that worked for three other production level machines.

We've emergency-installed the "4096" max frag page size workaround
for now as fifty people were a bit unhappy without network access... :D

Cheers,
Thomas

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html