Re: iMac and FreeBSD performance problems

From: Keith Mitchell (kmitch_at_guru.org)
Date: 10/31/03

  • Next message: Bill Vermillion: "Re: iMac and FreeBSD performance problems" 
    Date: Fri, 31 Oct 2003 11:09:56 -0500
To: ant@hutchtel.net

    Anthony Anderberg wrote:

    >>the iMac to a 10BT hub instead of the ethernet switch then everything
    >>seems to work fine as well. The iMac can talk to all the other equipment
    >>without a problem when its connected to the ethernet switch. Likewise
    >>
    >>
    >
    >Sounds like a duplex mis-match, which is especially
    >common with unmanaged switches. The problem
    >is that the computer and switch don't agree whether
    >their link is full duplex or half duplex. The result is
    >undetected collisions which must be retransmitted
    >via TCP timeouts instead of being retransmitted right
    >away by the NICs. I'd suggest setting the duplex on
    >the switch ports if possible and devices to see if a
    >combination works better, I'm not sure about the Mac
    >but you can get a list of media options on FreeBSD
    >using "ifconfig -m".
    >

    I have tried that but the switch seems retarded :-) I can't force the
    switch to do anything... If I force the computers to 100/half the
    switch leds indicate 100/full. And if I force the computer to 100/full
    the switch detects 100/half... argh. When I set the computers to
    autodetect then both the computers and the switch seem to agree on
    100/full (based on the ifconfig info and the leds on the switch). And
    they seem to work unless I want the Mac and the freebsd machines to talk
    to each other.

    But... Something is definately wrong with the switch... Out of
    frustration I went out and picked up another ethernet switch from a
    different vendor (one of the new Nway ones that supports uplink
    detection too) and with that switch everything works as expected.... I
    had thought that I ruled out the switch since I tried two different ones
    with the same result (one was a 5 year old linksys 16 port switch and
    the other is about a year old mini 5 port linksys switch). Both were
    linksys switches though :-( The one I bought today that seems to work
    great is a netgear switch.... Hopefully its not all linksys switches
    since I was planning on getting one of the Linksys 8 port GE switches (I
    can get a really good deal on it). I guess i'll just have to try and
    see :-(

    What i'd really like would be to get a 10/100/1000 managed switch but
    they want way too much for them to justify one for a home network :-(

    Thanks. 

    -- 
Keith Mitchell
Email: kmitch@guru.org			PGP key available upon request
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  • Next message: Bill Vermillion: "Re: iMac and FreeBSD performance problems"

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