sk0: watchdog timeout

Wilko Bulte wb at
Fri May 5 19:30:23 UTC 2006

On Fri, May 05, 2006 at 01:03:55PM -0400, Miles Lubin wrote..
> My motherboard has a built-in ethernet port that is handled by the sk 
> driver. I'm running FreeBSD 6.1-RC on amd64. When the network card is 
> under high load, it often kills any current connections and leaves the 
> message "sk0: watchdog timeout" in dmesg. I've seen previous posts on this 
> issue, but the problem doesn't seem to be resolved. This issue makes these 
> network cards unusable in production environments.
> Relevent dmesg output:
> skc0: <Marvell Gigabit Ethernet> port 0xa000-0xa0ff mem 
> 0xfbb00000-0xfbb03fff ir
> q 17 at device 10.0 on pci0
> skc0: Marvell Yukon Lite Gigabit Ethernet rev. (0x9)
> sk0: <Marvell Semiconductor, Inc. Yukon> on skc0

I had a similar event last night, on a P4 on an Asus P4P800.  The current
driver is much less prone to this lockup problem than it used to be.  In my
case it does not have to be in a high-load situation, it appears to happen
rather randomly (and *very* infrequently)

4 22:37:22 CEST 2006

skc0: <3Com 3C940 Gigabit Ethernet> port 0xe800-0xe8ff mem
0xf7ffc000-0xf7ffffff irq 22 at device 5.0 on pci2
skc0: 3Com Gigabit LOM (3C940) rev. (0x1)
sk0: <Marvell Semiconductor, Inc. Yukon> on skc0
sk0: Ethernet address: 00:0c:6e:4f:77:0c
miibus0: <MII bus> on sk0
e1000phy0: <Marvell 88E1000 Gigabit PHY> on miibus0
e1000phy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseTX-FDX, auto

For the time being I stuck a em(4) in this machine, it is my primary
server and I need to have it running for my work as re-builder for the Alpha
platform :)


Wilko Bulte				wilko at

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