Re: em(4) interface wedges

From: Christian Brueffer <brueffer_at_FreeBSD.org>
Date: Fri, 15 Sep 2006 21:10:09 +0200
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
GPG Key:	 http://people.freebsd.org/~brueffer/brueffer.key.asc
GPG Fingerprint: A5C8 2099 19FF AACA F41B  B29B 6C76 178C A0ED 982D

Received on Fri Sep 15 2006 - 17:12:34 UTC

This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:39:00 UTC