em0 hangs without any messages like "Watchdog timeout" only down/up reset it.

[Sean Bruno]

On Thu, 2011-02-24 at 03:03 -0800, Pete French wrote:
> I havent investigated far enough yet to see if this is the same problem, but
> I am also seeing hangs on em0 when under heavy load. This is 8-STABLE from
> the 17 at around 3pm.
> 
> em0 at pci0:0:25:0:        class=0x020000 card=0x281e103c chip=0x10bd8086 rev=0x02 hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Intel 82566DM Gigabit Ethernet Adapter (82566DM)'
>     class      = network
>     subclass   = ethernet
> 
> What I am doing here is using ggated/ggatec to provide drives to another
> machine which is adding them into a ZFS pool. This locks up the ethernet
> in about 20 minutes. Going to concole on the machine all looks fine,
> but it is not possible to ping anything through the em0 interface.
> 
> I have no special tunings for em0, though I do have expanded buffer
> space to improve the ggated performance
> 
> kern.ipc.maxsockbuf=1048576
> net.inet.tcp.sendspace=131072
> net.inet.tcp.recvspace=131072
> 
> Machine is amd64 with 6 gig of RAM.
> 
> -pete.
> _____________________________________
If you ifconfig down/up the interface does it come back to life?

Sean