em(4) interface wedges

[Christian Brueffer]

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
issue.

- Christian

-- 
Christian Brueffer	chris at unixpages.org	brueffer at FreeBSD.org
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