Re: 100Mbps Ethernet Speed/Efficiency

From: Laurence Orchard (laurence_at_orchards.org.uk)
Date: 04/06/04

  • Next message: Pedro Fernandes Macedo: "Re: Defragmenting disks under Linux" 
    To: Neall <neall@haughtmail.com>, For users of Fedora Core releases <fedora-list@redhat.com>
Date: Tue, 06 Apr 2004 22:28:06 +0100

    On Tue, 2004-04-06 at 22:18, Neall wrote:
    > >> I'm wondering what's the maximum sustained transfer rate
    > >> that one can experience when using a 100Mbps link?
    >
    > 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. Then, I copied from the first system's RAM disk over
    > ethernet, to the second system's RAM disk. Granted, NFS is in the
    > picture, but it would be using hard drives, too.
    >
    > These numbers include NFS overhead (obviously):
    >
    > 100 Mb file:
    > 100/T: 11.335 MByte/Sec (averaged over many tests).
    > 1000/T: 69.9 MByte/Sec.
    >
    > Obviously, the 1000/T (gigabit) test would have immediately been
    > bottlenecked by the drive transfer rates. The 100/T rates are near
    > theoretical. Not sure where the 1000/T bottle neck is, but I used stock
    > NFS parameters. I may try to transfer via socket or rpc, but just haven't
    > gotten there yet. I figured most people transfer via NFS (or SAMBA)
    > mounted drives, so wanted to start there.
    >
    > Still, ~70 MByte/sec isn't shabby over gigabit ethenet via NFS. Neall
    >
    >

    Hi

    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!

    Laurence 

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