RE: 100Mbps Ethernet Speed/Efficiency

From: Ow Mun Heng (ow.mun.heng_at_wdc.com)
Date: 04/07/04

  • Next message: Ow Mun Heng: "MUA Filters vs Procmail filters[was] RE: Mailing list procmail recipe" 
    Date: Wed, 7 Apr 2004 16:38:08 +0800
To: "For users of Fedora Core releases" <fedora-list@redhat.com>

    > -----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. 

    -- 
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