7.1-PRERELEASE : bad network performance (nfe0)

Jeremy Chadwick koitsu at FreeBSD.org
Sun Sep 28 19:35:12 UTC 2008

On Sun, Sep 28, 2008 at 01:43:12PM -0400, firmdog at 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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