RE: 100Mbps Ethernet Speed/Efficiency

From: Joel Jaeggli (joelja_at_darkwing.uoregon.edu)
Date: 04/07/04

  • Next message: Dov Zamir: "Some problems getting started" 
    Date: Wed, 7 Apr 2004 08:26:13 -0700 (PDT)
To: For users of Fedora Core releases <fedora-list@redhat.com>

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

    >
    >
    > > -----Original Message-----
    > > From: fedora-list-bounces@redhat.com
    > > [mailto:fedora-list-bounces@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.
     
    > 

    -- 
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Joel Jaeggli  	       Unix Consulting 	       joelja@darkwing.uoregon.edu    
GPG Key Fingerprint:     5C6E 0104 BAF0 40B0 5BD3 C38B F000 35AB B67F 56B2
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