em0 watchdog timeout with nfs

[Jack Vogel]

On 4/5/07, Jasper Berlijn <freebsd-stable at claranet.nl> wrote:
> Hi,
>
> At this moment I'm running FreeBSD 4.11 without any problems. A couple
> of times I've tried to upgrade to 6.x but without any luck because of
> the watchdog timeout errors on em0 when using nfs.
>
> Mar 30 11:30:48 large kernel: em0: watchdog timeout -- resetting
> Mar 30 11:30:48 large kernel: em0: link state changed to DOWN
> Mar 30 11:30:51 large kernel: em0: link state changed to UP
> Mar 30 11:31:01 large kernel: em0: watchdog timeout -- resetting
> Mar 30 11:31:01 large kernel: em0: link state changed to DOWN
> Mar 30 11:31:03 large kernel: em0: link state changed to UP
> Mar 30 11:31:20 large kernel: em0: watchdog timeout -- resetting
> Mar 30 11:31:20 large kernel: em0: link state changed to DOWN
> Mar 30 11:31:23 large kernel: em0: link state changed to UP
>
> em0 at pci0:14:0:  class=0x020000 card=0x002e8086 chip=0x100e8086 rev=0x02
> hdr=0x00
>     vendor   = 'Intel Corporation'
>     device   = '82540EM Gigabit Ethernet Controller'
>     class    = network
>     subclass = ethernet
>
> When I try to copy a large file (1gb) then after a couple of mb's
> (100mb) the wachtdog timeout will occur. The system is most of the time
> idle. Using debug.mpsafenet="0" in /boot/loader.conf doesn't make any
> difference.
>
> Any ideas?

The driver in 6.2 RELEASE fixed all known problems with
watchdogs, other than REAL issues with the network/hardware.
Have you tried installing that?

Jack