Re: 100Mbps Ethernet Speed/Efficiency

From: Jeff Vian (jvian10_at_charter.net)
Date: 04/07/04

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    Date: Tue, 06 Apr 2004 17:42:09 -0500
To: For users of Fedora Core releases <fedora-list@redhat.com>

    Neall wrote:

    >>On Tue, 2004-04-06 at 22:18, Neall wrote:
    >>
    >>
    >
    >
    >
    >>>I took the hard drives out of the picture. I set up RAM disks on two
    >>>different systems, and connected them via ethernet using NFS to cross
    >>>mount them.
    >>>
    >>>
    >
    >At a later time, Laurence Orchard <laurence@orchards.org.uk> wrote:
    >
    >
    >
    >>have you considered putting the data file in a ram disk to overcome the
    >>disk transfer overhead? assuming you have enough physical memory so you
    >>don't hit swapping!
    >>
    >>
    >
    >This is exactly what I did. Didn't I say that? :) The systems have 1
    >GByte RAM each, and the RAM disks were set to 100 Mbytes each. The data
    >file was copied from the hard drive to the local RAM disk, then the timing
    >began. RAM disk to RAM disk, via ethernet. Neall
    >
    >
    >
    IIRC you said you did that, then said you had cross mounted the ram
    disks via NFS.

    If in fact I understood correctly, your test would have involved
    transfering the data on the network 3 tines.

    Hosts involved -- Host1 & Host2

    test: Host 1 requests file from Host2

    flow: NFS Host1 to Host2
              transfer Host2 to Host1
              stored (NFS Host1 to Host2)

    If I misunderstood and you simply mounted the ram disks locally then it
    would be a different test and a simple one way transfer.

    Jeff 

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