Re: Excessive Collisions After FC1 Installation

From: Scot L. Harris (webid_at_cfl.rr.com)
Date: 07/28/04

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    To: Fedora List <fedora-list@redhat.com>
Date: Wed, 28 Jul 2004 12:36:11 -0400

    On Wed, 2004-07-28 at 11:38, Christopher A. Smith wrote:
    > I recently installed FC1 (still a little wary of FC2) on a workstation and
    > a laptop. Both had previously been running RH 9; FC1 was installed by
    > paving the hard drive and installing from scratch. Immediately after the
    > upgrade, I noticed a surge in Ethernet collisions and a corresponding
    > decline in network throughput and usability on both systems. Anything
    > that involves reading or writing more than 64k or so -- e.g., NFS work,
    > web browsing, Fedora updates -- results in collisions, and network
    > activity comes to a screeching halt for several seconds. Removing NFS all
    > together and working entirely off of local disk makes no difference.
    > (Didn't think it would, but it was worth a try.)

    >
    > Both systems had been running RH9 with the exact same hardware, and
    > collisions were never a problem. The laptop dual-boots Windows XP Pro,
    > and its network performance is what I'd expect; there's been no observable
    > or quantifiable difference in throughput.
    >
    > Does anyone have any ideas or suggestions on where I should look?
    > Problems with the driver (either) or its configuration? Or is this one of
    > those "Upgrade to FC2 and call us back" situations?
    >
    > Thanks!

    I would start by verifying the duplex settings on the NIC in the FC1 box
    and the port on the switch. mii-tool should let you check the setting
    and force it. 100Mbp connections should be set to full duplex.

    I have seen some cisco switches that fight with some systems (in my
    experience SUN servers had this problem). The auto-negotiate would not
    work as expected for some reason. Lock down the speed and duplex
    settings on the switch and the NIC to eliminate this as a possible
    problem. 

    -- 
Scot L. Harris
webid@cfl.rr.com
One good suit is worth a thousand resumes. 
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    Relevant Pages

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