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

From: Andre Oppermann (andre_at_freebsd.org)
Date: 09/17/04

  • Next message: Raphael H. Becker: "Re: Strange things on GBit / 1000->100 / net.inet.tcp.inflight.*" 
    Date: Fri, 17 Sep 2004 23:30:31 +0200
To: Andre Oppermann <andre@freebsd.org>

    Andre Oppermann wrote:
    > Raphael H. Becker wrote:
    >
    >> On Fri, Sep 17, 2004 at 02:48:21PM +0200, Andre Oppermann wrote:
    >>
    >>> "Raphael H. Becker" wrote:
    >>>
    >>>> My guess: The 5.3-Boxes send bigger TCP-Windows than our switch has
    >>>> buffer for each port resulting in massive packetloss or something like
    >>>> that. The sender is "too fast" for the switch or the switch isn't able
    >>>> to convert from 1000MBit to 100MBit under heavy load
    >>>> (store&forward-buffer)
    >>>
    >>>
    >>> Could you send me the output of (after you have run the 1000->100 test):
    >>>
    >>> # sysctl net.inet.tcp
    >>> # sysctl net.inet.tcp.hostcache.list
    >>> # netstat -s -p tcp
    >>> # netstat -s -p ip
    >>
    >>
    >> http://rhb.uugrn.org/FreeBSD/bugs/5.x/1000-to-100/check_before.txt
    >> http://rhb.uugrn.org/FreeBSD/bugs/5.x/1000-to-100/check_after.txt
    >
    >
    > Could you please provide the same information (except the second sysctl
    > one)
    > from the target machine as well. You don't have to show the difference
    > between before and after but try to make sure that not much other traffic
    > was going than the test.

    And could you do this on the 5.3 machine:

      # sysctl net.inet.tcp.rfc3042=0

    then restart and run the tests plus providing data for the 5.3
    and 4.10 machine again. 

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

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