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Date: Thu, 18 Nov 2004 11:43:53 -0500 (EST)
From: "Mike Jakubik" <mikej@rogers.com>
To: "Andreas Braukmann" <braukmann@tse-online.de>
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cc: Emanuel Strobl <emanuel.strobl@gmx.net>
cc: freebsd-stable@freebsd.org
Subject: Re: serious networking (em) performance (ggate and NFS) problem
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Andreas Braukmann said:
> --On Mittwoch, 17. November 2004 20:48 Uhr -0500 Mike Jakubik
> <mikej@rogers.com> wrote:
>
>> I have two PCs connected together, using the em card. One is FreeBSD 6
>> from Fri Nov  5 , the other is Windows XP. I am using the default mtu of
>> 1500, no polling, and i get ~ 21MB/s tranfser rates via ftp. Im sure
>> this
>> would be higher with jumbo frames.
>
> probably
>
>> Both computers are AMD cpus with Via
>> chipsets.
>
> Which AMD Chipset? VIA did some pretty bad PCI implementations
> in the past. Once I wondered about suspiciously low transfer
> rates in the process of testing 3Ware and Adaptec (2120S, 2200S)
> RAID-Controllers. The transfer rates maxed out at ca. 30 MByte/s.
> Switching the testboxes mainboard from one with VIA chipset to
> one with  an AMD (MP / MPX) chipset was a great success.

The FreeBSD box is KT133A and Windows is KT266A. The VIA chipsets had
bandwith or latency (i cant remember) issues with the PCI bus. Perhaps you
are maxing out your PCI bus, or the HDs cant keep up?