Re: Strange things on GBit / 1000->100 / net.inet.tcp.inflight.*

From: Andre Oppermann (andre_at_freebsd.org)
Date: 09/18/04

  • Next message: Raphael H. Becker: "Re: Strange things on GBit / 1000->100 / net.inet.tcp.inflight.*" 
    Date: Sat, 18 Sep 2004 03:15:07 +0200
To: "Raphael H. Becker" <rabe@p-i-n.com>

    "Raphael H. Becker" wrote:
    >
    > On Sat, Sep 18, 2004 at 01:11:13AM +0200, Andre Oppermann wrote:
    > > I'm unable to reproduce your problem.
    > >
    > > Usually in these cases there is an ethernet duplex mismatch somewhere.
    > > Can set the network cards and the switches to fixed 1000 or 100 full-duplex?
    >
    > Yes, one of my first tests. Both machines fixed to their nominal
    > transfer rate. Tested different ports, different irons (source and
    > target), different cables. Always same result.
    >
    > All channels are able to do their maximum speed.

    Ok.

    > Changing target and source (100 -> 1000) resulted in >10MBytes/sec, same
    > machines, same cables, same everything 1000 -> 100 resulted in what we
    > discuss here (300kBytes).
    >
    > 100->100 (between the two PE350) is working fine, too.
    >
    > The problematic case (1000 -> 100) was tested with 3 machines 5.x and 2
    > machines 4.x, all cases the same.

    Hmmm...

    > I'm not sure this is a "physical" problem.

    The high number of out-of-order packets on your 4.10 machine is very
    suspicious.

    > I will try something else next days:
    > * New cables
    > * FreesBIE with 4.10 on the 5.3-Boxes, ftp'in /dev/zero directly to /dev/null ...
    > * throtteling 1000MBit ... maybe
    >
    > Maybe:
    > * another GBit-Switch (if available)

    That would be nice. Try to get some other brand or model than the one
    you have now.

    > Workaround:
    > * Buy 1000MBit-Cards for the both "Router"-boxes

    Why that? Do you have to do TCP transfer to/from these machines?

    Yet another test you could try:

     5.3 GE ---> FE 4.10 "Router" FE ---> 4.10 FE 

    -- 
Andre
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  • Next message: Raphael H. Becker: "Re: Strange things on GBit / 1000->100 / net.inet.tcp.inflight.*"