Re: 100Mbps Ethernet Speed/Efficiency

From: Jeff Vian (jvian10_at_charter.net)
Date: 04/06/04

  • Next message: John Walsh: "Re: MP3s and Linux [ogg format]" 
    Date: Tue, 06 Apr 2004 08:09:08 -0500
To: For users of Fedora Core releases <fedora-list@redhat.com>

    WipeOut wrote:

    > Ow Mun Heng wrote:
    >
    >> Hi Guys,
    >>
    >> I'm wondering what's the maximum sustained transfer rate
    >> that one can experience when using a 100Mbps link?
    >> Is there any way that I can determine what's the bottleneck?
    >> FYI, I'm using iftop.
    >>
    >> 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
    >>
    >> 1mbps = 1024/8 bits = 1 MB/s (I know there's a conversion
    >> but I'm forgetful)
    >>
    >>
    >> Cheers, Mun Heng,
    >> Ow
    >>
    >>
    >>
    >>
    >>
    > Without compression and overhead 100Mb/s transtales to about 12.5MB/s..
    >
    > Of course that is the theoretical maximum..
    >
    > If you add overhead and contention you will probbaly see an actual
    > transfer of between 60Mb/s and 90Mb/s..
    >
    > I am not sure how you have managed to see a throughput of 20MB/s on a
    > 100Mb/s link..
    >
    > Later..
    >
    I did a test between 2 machines here on a 100Mb switch and got about
    8.2MB/sec tranfer. That is pretty close to 2/3 the theoretical maximum
    without compression. Used a 650MB iso image for the test. Smaller
    files would be different. 

    -- 
fedora-list mailing list
fedora-list@redhat.com
To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list
  • Next message: John Walsh: "Re: MP3s and Linux [ogg format]"