From owner-freebsd-net@FreeBSD.ORG  Wed Sep 21 14:13:15 2005
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Date: Wed, 21 Sep 2005 17:13:11 +0300
From: Maxim Tuliuk <mt@primats.org.ua>
To: Benjamin Rosenblum <ben@benswebs.com>
Message-ID: <20050921141311.GA40222@top.net.ua>
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Cc: freebsd-net@freebsd.org
Subject: Re: Problems with SK and EM network cards/drivers on my system
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On Sun, Sep 18, 2005 at 14:15 -0400, Benjamin Rosenblum wrote:
...
> now the EM problem.
> 
> when i am running a very high network load (streaming video, dumping 
> ALOT of data across the network, etc) the network card disconnects (i 
> loose pings and all my transfers drop) and 15-20 seconds later it pops 
> up on the console with "em0: Link is up 1000 Mbps Full Duplex" and then 
> it starts working again.  again im at a dead wall and really want my 
> network to work properly so i can do what i need to do.

Hello!
I've same problems on 5.4-STABLE:
/var/run/dmesg.boot:
FreeBSD 5.4-STABLE #5: Tue Sep 13 16:14:10 EEST 2005
em0: <Intel(R) PRO/1000 Network Connection, Version - 1.7.35> port 0xbc00-0xbc1f mem 0xff8e0000-0xff8fffff irq 18 at device 1.0 on pci1
em0: Ethernet address: 00:0c:f1:cf:7e:b6
em0:  Speed:N/A  Duplex:N/A

/etc/rc.conf:
ifconfig_em0="inet ... netmask ... media 100baseTX mediaopt full-duplex"

/var/log/messages:
Sep 20 15:51:40 tak kernel: em0: Link is up 100 Mbps Full Duplex
Sep 20 17:01:40 tak kernel: em0: Link is up 100 Mbps Full Duplex
Sep 20 18:48:16 tak kernel: em0: Link is up 100 Mbps Full Duplex

switch: Catalyst 3550
I changed ports: 100M to 1GB and back; changed cables, but...
no positive results :(
-- 
Maxim Tuliuk
WWW: http://primats.org.ua/~mt/
ICQ: 21134222

The bike is absolute freedom of moving