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Date: Tue, 10 Aug 2004 17:11:53 -0400
To: "Marc G. Fournier" <scrappy@hub.org>, freebsd-stable@freebsd.org
From: Mike Tancsa <mike@sentex.net>
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cc: freebsd-net@freebsd.org
Subject: Re: em driver worse then fxp driver ... why?
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At 04:37 PM 10/08/2004, Marc G. Fournier wrote:

>I have 5 servers sitting on a Linksys 10/100 switch ... 4 of the 5 are 
>running fxp0 ethernet, while the 5th is running em ... and the 5th 
>performs atrociously:
>
>neptune# netstat -ni | head
>Name    Mtu Network       Address              Ipkts Ierrs    Opkts 
>Oerrs  Coll
>em0    1500 <Link#1>    00:07:e9:05:1b:2e 36915965 10306 28888840     1 
>10858513
>
>I've tried in bth half and full duplex mode .. full duplex, Ierrs climbs, 
>half-duplex, Collisions climb ...

if its unmanaged, autoneg is all that will work.  Try that and see if the 
errors climb.  If you are still seeing errors check the cables. There are 
occasionally incompatibilities between certain NICs and switches, but thats 
pretty rare see /usr/src/sys/dev/em/README

         ---Mike