ping delay, initial request

From: Roman Kurakin (rik_at_cronyx.ru)
Date: 07/12/05

  • Next message: Philip Olsson: "Re: ipfw+dummynet only getting half bandwidth when using routed interfaces." 
    Date: Tue, 12 Jul 2005 16:38:00 +0400
To: freebsd-net@freebsd.org

    Hi,

        I am starting to investigate some net problem and I wonder if this
    problem seen/known.
        The problem was observed with ce(4) (Cronyx Tau32-PCI/Lite,
    it is not in the tree yet, but similar to cp(4)/ctau(4) devices) and
    sppp(4).
    If you run usual ping you will see normal delay which is much less than
    1sec.
    But if you run flood ping, stop it, and run normal ping again you'll see
    delay
    about one sec.

    ping x.x.x.x
    delay << 1 sec
    ping -f x.x.x.x
    average delay << 1 sec
    ping x.x.x.x
    delay ~ 1 sec

    This was seen on FreeBSD 4.11 stable.

    Any ideas? Does any body observed such behaviour in other environment?

    rik

    _______________________________________________
    freebsd-net@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-net
    To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"

  • Next message: Philip Olsson: "Re: ipfw+dummynet only getting half bandwidth when using routed interfaces."

    Relevant Pages

    • Re: ping delay, initial request
      ... >>If you run usual ping you will see normal delay which is much less than ... >>But if you run flood ping, stop it, and run normal ping again you'll see ...
      (freebsd-net)
    • Re: How to ping in Python?
      ... I could not find any "ping" Class or Handler in python to ping a machine. ... # Changed the struct.packcalls to pack the checksum and ID as # unsigned. ... csum = csum + thisVal ... # Returns either the delay or none on timeout. ...
      (comp.lang.python)
    • Re: Something like "ping" for windows messages.
      ... I'm pretty sure it's no where near that delay. ... the http server was being hammered and it didn't seem too bad. ... I've tried out my "ping" programme on Visual Studio. ... Apparently it doesn't scale past roughly 20 connections I ...
      (microsoft.public.vc.mfc)
    • Re: Networking delay & timeout
      ... > to that server), my firewall produces Initial delays around 1000ms! ... > If i ping later on, delay remains that low. ... > Please read the FAQ at http://www.tux.org/lkml/ ...
      (Linux-Kernel)
    • strange delay while dns resolve
      ... If I ping my router or a ip out in the internet, ... When I ping using the host name instead, ... The ping times stay the same but between each ping is a 2 second delay, ... resolveip has the same delay ...
      (comp.os.linux.networking)