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Date: Fri, 15 Sep 2006 18:51:06 -0700
From: "Jack Vogel" <jfvogel@gmail.com>
To: "Christian Brueffer" <brueffer@freebsd.org>
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References: <20060915165351.GC2020@haakonia.hitnet.RWTH-Aachen.DE>
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	<20060915191008.GE2020@haakonia.hitnet.RWTH-Aachen.DE>
Cc: Andre Oppermann <andre@freebsd.org>, current@freebsd.org
Subject: Re: em(4) interface wedges
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On 9/15/06, Christian Brueffer <brueffer@freebsd.org> wrote:
> On Fri, Sep 15, 2006 at 08:09:20PM +0200, Andre Oppermann wrote:
> > Scott Long wrote:
> > >Christian Brueffer wrote:
> > >
> > >>Hi,
> > >>
> > >>with the latest em(4) code in current (sans the printf/device_printf
> > >>change), my interface wedges every few hours.  It can be resurrected
> > >>by bringing it down and up again.
> > >>
> > >>The device in question is a E1000_DEV_ID_82540EP_LP built into my
> > >>Thinkpad.
> > >>
> > >>Anyone else seeing this?
> > >>
> > >>- Christian
> > >>
> > >
> > >Yes.  It's also almost guaranteed to wedge the first time I do a remote
> > >CVS operation after boot.
> >
> > When the interface wedges does it show the OACTIVE flag in ifconfig output?
> > This is an important hint.
> >
>
> Yeah, OACTIVE is set.
>
> > If you are running at 100Mbit there seems to be bug in the em(4) harware
> > with TSO.  Try disabling TSO on it with 'ifconfig em0 -tso'.
> >
>
> Correct, I'm using it at 100Mbit and disabling TSO works around the
> issuue.

That NIC should not be TSO capable so I'm confused by disabling it
in this case would have an effect... hmmmm....

Jack