[Samba] (Repost to list) Copying large files xp pro -> Samba very slow

John H Terpstra jht at samba.org
Mon Mar 24 17:32:56 GMT 2003

On Mon, 24 Mar 2003, James Richardson wrote:

> > On Mon, 24 Mar 2003, James Richardson wrote:
> >
> >> I previously posted this to the linux.samba mailing list. I'm not sure
> >> that was the right place, so here it is again. Apologies if you've
> >> already seen it.
> >
> > James,
> >
> > What happens when you use a cross-over cable between the client and the
> > samba server? ie: Eliminate the HUB.
> >
> Hmm. The hub could be a problem, but it appears to be working OK.. I will
> check later on this evening to see if FTP will work better. This should
> eliminate basic connectivity problems, and moves the issue up to the
> protocol layer.

Not necessarily. The way a HUB behaves is much influenced by the type of
traffic on the network.

> I have a feeling that the issue is at the SMB (or whatever) protocol
> layer, as I am seeing some period of time where the speed is fine (66% of
> theoretical max, and IIRC 70% is max optimal rate)..

If there were to be a problem at or above the SMB layer then why are we
not seeing lots of other complaints in this area? I have transferred over
30GB of data over 100BaseT at av average of over 10MBytes/sec with no
burstiness at all. I have transferred this same data over 1000BaseT at
just under 70Mbytes/sec average rate.

My hunch is that you have either a badly behaving NIC or HUB, or else you
are seeing the effects of incompatibilities between them.

- John T.
John H Terpstra
Email: jht at samba.org

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