Network often not responding

[Akhmad Sakirun]

Hello,

right now, i'm using 3com ethernet:
xl0: <3Com 3c905B-TX Fast Etherlink XL> port 0xa880-0xa8ff mem 0xfeafec00-0xfeafec7f irq 19 at device 7.0 on pci2
miibus0: <MII bus> on xl0
xlphy0: <3Com internal media interface> on miibus0
xlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
xl0: Ethernet address: 00:10:5a:0d:c1:45

onboard ethernet which disabled via BIOS was:
Intel 82541E1 GbE

Average traffic is 10-15Mbps on bussy hours,

and connected client average < 1000
#netstat -n | grep EST | wc -l
#     780

I really confused, i don't have any other Freebsd AMD64 system installed, but other
with i386 system never got any problem like this.

Best regards,

Wednesday, August 9, 2006, 9:10:01 PM, Dominic wrote:
> Googling for the second line I found this:

> http://lists.freebsd.org/pipermail/freebsd-doc/2005-November/009273.html

> It quotes this part of the manual page for dc, another network card:

> "This is from the dc(4) man page:

>       dc%d: TX underrun -- increasing TX threshold  The device generated a
>       transmit underrun error while attempting to DMA and transmit a packet.
>       This happens if the host is not able to DMA the packet data into the
>       NIC's FIFO fast enough.  The driver will dynamically increase the
> trans-
>       mit start threshold so that more data must be DMAed into the FIFO
> before
>       the NIC will start transmitting it onto the wire."

> So it would seem like the card cannot keep pace with the system. What NICs
> have you tried?

> Dom

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