Re: 100Mbps Ethernet Speed/Efficiency

From: Neall (neall_at_haughtmail.com)
Date: 04/07/04

  • Next message: Tom Weniger: "Re: network newbie" 
    Date: Tue, 6 Apr 2004 16:56:08 -0600 (MDT)
To: Joel Jaeggli <joelja@darkwing.uoregon.edu>

    On Tue, 6 Apr 2004 at 3:38pm, Joel Jaeggli <joelja@darkwing.uoregon.edu>...:

    > You can build a pretty wicked disk subsystem these days. single 15k rpm
    > disk-drives can read a rate of around 86-78MB/s depending on what part of

    Technology Marches on! My keeping up with it doesn't :)

    > Do the machines in question have the ethernet in 64 bit pci slots?

    It's an SBC, and ethernet is on board. The schematic shows an
    interconnect via 64-bit PCI-X, 133 MHz, via an Intel 82870P2 PCI/PCI-X
    hub. The eth chip itself is an Intel 82546EB. Dual Gigabit. Soldered
    in. Copper trace PCI, but no plug-in connectors.

    > block reads on 4GB files from a netap-940 we were testing were order of
    > 83MB/s using jumbo 9k ethernet frames... dropping that to 1500mtu made it

    Off topic (SORRY): Where do I tune these parameters in my NFS setup?
    I'm actually running RHEL WS3.0 (not Fedora) but should be similar.

    > desktop which just has 100baset. For small switched environments where
    > performance is important unmanged gig copper switches now cost order of
    > $20 a port or less, so if you need the speed it may be cheap.

    Exactly, our plan is it run multiple SBCs but not have them communicate
    over a backplane. Instead, using an unmanaged, copper giga switch and
    Cat5E between them. :) Endpoints will be NFS-mounted RAM disks. You
    folks are demonstrating to me that it's a pretty efficient pipeline.

    Neall 

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