linux-kernel - Re: WARNING: at net/sched/sch_generic.c:219 dev

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Date:	Thu, 27 Nov 2008 06:16:59 +0100
From:	Willy Tarreau <w@....eu>
To:	Matt Carlson <mcarlson@...adcom.com>
Cc:	Roger Heflin <rogerheflin@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: WARNING: at net/sched/sch_generic.c:219 dev_watchdog+0xfe/0x17e() with tg3 network

On Wed, Nov 26, 2008 at 02:54:21PM -0800, Matt Carlson wrote:
(...)
> > I've run a new test on a switch I have here at home (another el-cheapo,
> > non-manageable 100 Mbps, netgear this time). Unfortunately I cannot
> > reproduce the problem at all. I have disabled FC on my laptop, it did
> > not have any effect.
> 
> Disabling FC should have a positive effect, not a negative one.  It
> might be the case that the switch does not advertise nor support FC.  If
> that is true, you might not be able to repro the problem no matter what
> you did (if your problem is what I think it is).  Can you check your
> link messages and see if it really is negotiated to off?  (I see the
> message above, but I don't think that is with the current switch.)

yes the switch does advertuse FC :

willy@...p:~$ dmesg|grep eth0
eth0: Tigon3 [partno(BMC5705mA3) rev 3003 PHY(5705)] (PCI:33MHz:32-bit) 10/100/1000Base-T Ethernet 00:0d:9d:91:ef:24
eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] WireSpeed[0] TSOcap[1]
eth0: dma_rwctrl[763f0000] dma_mask[64-bit]
tg3: eth0: Link is up at 100 Mbps, full duplex.
tg3: eth0: Flow control is on for TX and on for RX.

> > I have disabled auto-neg and manually forced the
> > speed to 100/Full on my laptop, and could not reproduce the problem
> > either (though the speed was much lower due to the switch obviously
> > negociating 100/Half when not seeing my NWay frames).
> 
> Yes.  If you force the link, both sides must be forced.  The switch
> rightly assumes HD when bringing the link up.

I know ;-) but not seeing the problem, I started to suspect that the other
switch was a little bit ill and tried to reproduce some problems I might
incidently have been encountering on it.

Regards,
Willy

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