Re: ping delay, initial request

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

  • Next message: Giorgos Keramidas: "Re: ping delay, initial request" 
    Date: Tue, 12 Jul 2005 17:55:37 +0400
To: Giorgos Keramidas <keramida@freebsd.org>

    Giorgos Keramidas wrote:

    >On 2005-07-12 16:38, Roman Kurakin <rik@cronyx.ru> wrote:
    >
    >
    >>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?
    >>
    >>
    >
    >Is it possible that flood ping hits an icmp rate-limiting watermark and
    >then every subsequent icmp packet gets penalized with a delay until a
    >fair amount of time passes?
    >
    >
    Wasn't observed on ethernet iface. But this is good idea to test delay
    by some other type
    of packets. Do you know any good ans simple tool for that?

    rik

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  • Next message: Giorgos Keramidas: "Re: ping delay, initial request"

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