100Mbps Ethernet Speed/Efficiency

[Ow Mun Heng]

> -----Original Message-----
> From: fedora-list-bounces at redhat.com
> [mailto:fedora-list-bounces at redhat.com]On Behalf Of Rodolfo J. Paiz
> Sent: Tuesday, April 06, 2004 10:20 PM
> To: For users of Fedora Core releases
> Subject: RE: 100Mbps Ethernet Speed/Efficiency
> >Ow Mun Heng wrote:
> >
> > >Transferring files between 2 PCs, (laptop and Desktop)
> > >I see like up to 20MB/s.
> > >
> > >Could this # be limited due to my slow HD? 4200rpm which 
> hdparm -t (or
> > >is it -T) gives ~26MB/s
> 
> This shows a classic mistake in labeling. Transfers are 
> supposed to be 
> 20MBps which would be 160 Mbps which is not bloody likely, 
> whereas hdparm 
> output could quite realistically be 26MBps (~208 Mbps). I can 
> believe the 
> hard drive output, but not the transfer speeds. Most likely 
> Ow Mun Heng is 
> getting 20 Mbps per second which looks slow to me. But we 
> can't be sure 
> without more data from him.

I always Gets mixed up.. :)

Okay.. I'm transferring the files using a dedicated 1-1 laptop to
desktop (linux -> windows) on a 100Mbps NIC.

I mount the share as a smbfs share and copy the files(120MB average
realmedia files)
 from linux to windows share

cp *.rm /mnt/desktop

I look at iftop..

I see 3 figures..
43.9Mb 46.2Mb 26.4Mb

(I take it that translate to 1bit=8bytes, 43.9Mbs/8=5.5MB/s??)

Using Gkrellm I see
transmit = 6.1M

SO.. I'm at a loss. What's the best method for measuring throughput?
I'm gonna try out the ttcp util mentioned by dalen. (but Until now, I've not

received a email response from them!!)

so... I'm at a loss.