linux-kernel - Re: e1000 issue on DQ965GF board (was 24 lost ticks with 2.6.20.10 kernel)

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Date:	Fri, 04 May 2007 11:25:43 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Michel Lespinasse <walken@....org>
CC:	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	Chuck Ebbert <cebbert@...hat.com>,
	linux-kernel@...r.kernel.org, Dave Jones <davej@...hat.com>,
	Jeb Cramer <cramerj@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: Re: e1000 issue on DQ965GF board (was 24 lost ticks with 2.6.20.10
 kernel)

Michel Lespinasse wrote:
> On Wed, May 02, 2007 at 11:14:52AM -0700, Kok, Auke wrote:
>> I just checked and the fix I was referring to earlier didn't make it into 
>> 2.6.21-final. You can get 2.6.21-git1 from kernel.org which has the fix. See
>>
>> http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.21-git1.log
> 
> Good. So I tried that patch (well, actually only the change visible at
> http://lkml.org/lkml/2007/3/6/268). I patched it into a 2.6.20.11 kernel,
> using the same config file as previously. The good news is that this fixes
> my issue: there are no lost ticks anymore, and the link does negotiate a
> gigabit connection. This is a great improvement for me :)
> 
> I still seem to hit an issue if using the ethtool command, though.
> when using 'ethtool -s eth0 autoneg on', the link comes up at gigabit speed,
> but a couple seconds later is comes down again, and then up at 100 megabits:
> 
> e1000: eth0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex
> e1000: eth0: e1000_watchdog: NIC Link is Down
> e1000: eth0: e1000_watchdog: NIC Link is Up 100 Mbps Full Duplex
> e1000: eth0: e1000_watchdog: 10/100 speed: disabling TSO
> 
> The same thing happens if I use ifdown eth0; ifup eth0 too. Once again,
> I only observe this on my DQ965GF motherboard, the DG965RY board is fine
> (stays at gigabit speed when I issue these commands).
> 
> Is this something you could easily reproduce at Intel or would you want me
> to look into that issue on my system ?

can you try turning off the "management enable" function in the BIOS of the 
DQ965GF? That fixes this issue for us in our labs. A fix for this is also 
available in our standalone 7.5.5.1 driver (obtainable from e1000.sf.net), but 
it hasn't made it upstream yet.

Auke
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