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Date: Wed, 27 Sep 2006 08:00:21 +0200
From: Martin Nilsson <martin@gneto.com>
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Subject: 6.2 SHOWSTOPPER - em completely unusable on 6.2
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mailbox# uname -a
FreeBSD mailbox 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #0: Fri Sep 22 
00:31:29 CEST 2006
root@mailbox:/usr/obj-local/usr/src/sys/SMP  amd64

I get tons of these:
em0: watchdog timeout -- resetting
em0: link state changed to DOWN
em0: link state changed to UP

mailbox# pciconf -lv
em0@pci13:0:0:  class=0x020000 card=0x108c15d9 chip=0x108c8086 rev=0x03 
hdr=0x00
     vendor   = 'Intel Corporation'
     device   = 'PRO/1000 PM'
     class    = network
     subclass = ethernet
em1@pci14:0:0:  class=0x020000 card=0x109a15d9 chip=0x109a8086 rev=0x00 
hdr=0x00
     vendor   = 'Intel Corporation'
     class    = network
     subclass = ethernet

em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
         options=b<RXCSUM,TXCSUM,VLAN_MTU>
         inet6 fe80::230:48ff:fe89:c958%em0 prefixlen 64 scopeid 0x1
         inet 192.168.10.2 netmask 0xffffff00 broadcast 192.168.10.255
         ether 00:30:48:89:c9:58
         media: Ethernet autoselect (1000baseTX <full-duplex>)
         status: active

Motherboard is a Supermicro PDSMi+

I have only seen them on em0. Yesterday I tried sysutils/cpuburn on 
similar boxes that are netbooted with NFS mounted drives and everytime I 
loaded the two CPU cores the network went down.

I have not tested with other NIC:s so I don't know if the bug is in the 
em driver or somewhere else in the kernel.

I will update my 6.2 now and see if it works better. I will also test 
with a bge PCIe adapter if the problem persists.


Regards,
Martin