ng_fec and cisco 2931

From: David Gilbert (dgilbert_at_dclg.ca)
Date: 02/28/05

  • Next message: Lister: "Re: ng_fec and cisco 2931" 
    Date: Mon, 28 Feb 2005 11:11:25 -0500
To: Lister <lister@primetime.com>

    >>>>> "lister" == lister <lister@primetime.com> writes:

    lister> I have setup ng_fec on a machine with a quad ethernet NIC :

    lister> de0: <Digital 21140A Fast Ethernet> port 0xd000-0xd07f mem

    Our own testing with this card (not using fec ... just traffic on the
    4 ports) has determined that it appears to have a 100 megabit limit to
    the total of 4 ports on the card. Now... this could be a FreeBSD
    driver issue ... or a PCI bus issue, but in all our tests with several
    motherboards and many versions of FreeBSD (from 3.2 or so through
    about 4.5) we were never able to achieve more than 100 megabit on the
    card in total.

    Our application was an NFS server that had 100's of diskless nodes
    running from it. We suspected that this could be some interaction
    between the speed of the disks (and their pci cost) and the card, so
    we isolated the card by doing straight packet tests (no meaningful
    data) and still found the card maxxing out at 100 megabit total over
    the 4 ports.

    Dave. 

    -- 
============================================================================
|David Gilbert, Independent Contractor.       | Two things can only be     |
|Mail:       dave@daveg.ca                    |  equal if and only if they |
|http://daveg.ca                              |   are precisely opposite.  |
=========================================================GLO================
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  • Next message: Lister: "Re: ng_fec and cisco 2931"

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