slow data transfer over nfs ... is it fedora?

[Marcel J.E. Mol]

On Mon, Dec 08, 2003 at 06:42:28AM -0600, Harry Putnam wrote:
> "Marcel J.E. Mol" <marcel at mesa.nl> writes:
> 
> >> The "-HD" = Half duplex = kiss of death for speed.  This usually
> >> indicates either a bad cable or an incorrectly configured network
> >> box.  We'd had problems with DEC/Compaq AlphaStations in this regard.
> >> The solution was generally to configure your network box and/or workstation
> >> to 100baseT/Full and *don't* let it autonegotiate.
> >
> > As far as I know you get only HD when conected to a hub. When connected to
> > a switch you should get FD.
> 
> Do you know any more about why that might be the case?

Not from my head. I noticed the difference a while ago and asked
a REAL networking specialist about it. He did explain it but I forgot
the details. The important think to remember was that hubs connect at
half duplex and swithces can do both half and full duplex. And this
is exactly what I see: At home I half a 10Mb hub and have HD connections,
and the offices has a swithc and I see FD connections.

Most of the time is not a problem. 
I have no problems running NFS over the HD connection (the hub at home
is connected to the switch in the office). Most of the time at home I
NFS-read from the office servers and this goes at 6 to 9 MB/s for large
transfers...

-Marcel
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