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Date:      Sun, 28 Sep 2008 12:35:11 -0700
From:      Jeremy Chadwick <koitsu@FreeBSD.org>
To:        "firmdog@gmail.com" <firmdog@gmail.com>
Cc:        stable@freebsd.org, net@freebsd.org
Subject:   Re: 7.1-PRERELEASE : bad network performance (nfe0)
Message-ID:  <20080928193511.GB87069@icarus.home.lan>
In-Reply-To: <fa1676af0809281043k269b3d78sbf1e8006f2aa282e@mail.gmail.com>
References:  <wptzc1gu9v.fsf@heho.snv.jussieu.fr> <fa1676af0809281043k269b3d78sbf1e8006f2aa282e@mail.gmail.com>

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On Sun, Sep 28, 2008 at 01:43:12PM -0400, firmdog@gmail.com wrote:
> I have the same problem on a Dell Poweredge SC440 when I transferred over
> 50GB
> from a FreeBSD 5.4 box to my new Dell running 7.1.  Used a crossover cable
> and
> the link was 1000 full duplex, but could only get about 10M/s.  Very odd.

> Did a tcpdump and saw lots of bad checksum errors.

This is probably because checksum offloading was being done on the NIC.

-- 
| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |




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