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Date: Thu, 30 Oct 2008 13:15:04 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Graham Bentley <admin@cpcnw.co.uk>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Marvell 88E8052 PCI-E LAN on FreeBSD 7.0
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> I discovered that adding -txcsum and -rxcsum (i.e.
> disabling hardware checksuming) to the ifconfig
> statement, the performance was as quick as it is
> on that other OS!

there is a lot of buggy chips produced today.

normally the should go to thrash, but - what a problem - they put onto 
motherboards so user have no choice. then they include windoze drivers 
that simply disable non-working features and they are happy, not even 
telling anyone about this.

unless you are buying motherboard for servers, DO NOT expect lan to work ;)

it's my common practice.

nvidia ethernet was the worst one (it never worked), but realtek gigabit 
ethernet on other motherboard needed the same as yours (-txcsum, -rxcsum) 
or it randomly drop packets, probably because it calculates checksums 
wrong.