100Mbps Ethernet Speed/Efficiency

[Joel Jaeggli]

On Wed, 7 Apr 2004, Ow Mun Heng wrote:

> 
> 
> > -----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.
> 

for remotely mounted filesystems bonnie++ or iozone can actually provide
good io benchmarks... ttcp is pretty good at probbing the limits of your
network hardware.
 
> 

-- 
-------------------------------------------------------------------------- 
Joel Jaeggli  	       Unix Consulting 	       joelja at darkwing.uoregon.edu    
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