8.0 network problem

[Garrett Cooper]

On Jul 4, 2010, at 5:52 PM, David Warren wrote:

> Hi all,
> 
>     I've got a persistent problem with my LAN.  I'm running a FreeBSD 8.0
> box as a home server performing the following functions for wired and
> wireless networks: router; firewall; DHCP server; and file server.  For what
> it's worth, I've got ZFS up and running as the main filesystem.  The
> recurring issue is that file transfers from the FreeBSD box to computers on
> the wired network (gigabit) start out fast and then become agonizingly
> slow.  I'm sharing home directories over Samba, and those transfers work
> briefly and then tail off to a few kilobytes per second.  The failure is
> somewhat predicatable in that it tends to happen once a few hundred
> megabytes have been transferred.  I've swapped out hardware, I've Googled
> extensively, and all of the (possibly benign) error messages that I've found
> have been eliminated.  I'm happy to post logs, configs, etc., and I'd
> appreciate any help with a diagnosis.  For the moment:

	Disable rxcsum and txcsum on the cards; see if that does the trick.
	Before that, I'd see whether or not Jack Vogel (the current em(4) maintainer) would some details about your traffic, like a tcpdump session log.
HTH,
-Garrett