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Date:      Sun, 4 Jul 2010 22:04:18 -0700
From:      Garrett Cooper <yaneurabeya@gmail.com>
To:        David Warren <davideugenewarren@gmail.com>
Cc:        freebsd-stable@freebsd.org, jvogel@freebsd.org
Subject:   Re: 8.0 network problem
Message-ID:  <5D34EED0-9560-45A1-ADCF-176C4996E17E@gmail.com>
In-Reply-To: <AANLkTin4l7-UzDQW04voF6Lf-vMaHhCrvXP39GGsmgKG@mail.gmail.com>
References:  <AANLkTin4l7-UzDQW04voF6Lf-vMaHhCrvXP39GGsmgKG@mail.gmail.com>

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

> Hi all,
>=20
>     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=



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