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Date:      Fri, 11 Mar 2005 01:24:33 -0800
From:      Luigi Rizzo <rizzo@icir.org>
To:        jim song <jingmin.song@gmail.com>
Cc:        freebsd-ipfw@freebsd.org
Subject:   Re: why my dummynet queue not work?
Message-ID:  <20050311012433.C66627@xorpc.icir.org>
In-Reply-To: <d018391a050310220622b50cd3@mail.gmail.com>; from jingmin.song@gmail.com on Fri, Mar 11, 2005 at 02:06:02PM +0800
References:  <d018391a050310200327a01c48@mail.gmail.com> <20050311043933.GA28686@odin.ac.hmc.edu> <d018391a050310213469df3025@mail.gmail.com> <20050310215250.A65126@xorpc.icir.org> <d018391a050310220622b50cd3@mail.gmail.com>

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On Fri, Mar 11, 2005 at 02:06:02PM +0800, jim song wrote:
> Luigi,
> 
> I think what you said is the working window. It could be different to
> the initial window I set for the tcp stream. Tcp should get full bandwidth
> throughput in such circumstance.
> 
> But in my testing, tcp window has retreated from 5M window to 640K. 
> That is the problem.
> 
> Am I right?

i think you are just being lazy :)

seriously, i don't mean to be rude but brooks and i and possibly
others already suggested that it is likely a window problem
(as we have already been hit by that). What you should do is do
your homework and run a few
experiments with different delay settings, taking note of the
actual delays (with a PING measurement e.g) and bandwidths, and
figure out if there is a window/rtt pattern and in case determine
what window is in use.

then there are (as we already said) multiple parameters that cap
the window: the TCP window, the socket buffer, window scale options
etc on both sender and receiver.

	cheers
	luigi

> Thanks,
> --Jim
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