Skip site navigation (1)Skip section navigation (2)
Date:      Fri, 11 Mar 2005 01:24:33 -0800
From:      Luigi Rizzo <>
To:        jim song <>
Subject:   Re: why my dummynet queue not work?
Message-ID:  <>
In-Reply-To: <>; from on Fri, Mar 11, 2005 at 02:06:02PM +0800
References:  <> <> <> <> <>

Next in thread | Previous in thread | Raw E-Mail | Index | Archive | Help
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.


> Thanks,
> --Jim
> _______________________________________________
> mailing list
> To unsubscribe, send any mail to ""

Want to link to this message? Use this URL: <>