From owner-freebsd-ipfw  Thu Aug 30 10:24:43 2001
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From: Luigi Rizzo <rizzo@aciri.org>
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Subject: Re: DUMMYNET
In-Reply-To: <NDBBIMKICMDGDMNOOCAIOEEODGAA.patrick@mip.co.za> from "Patrick O'Reilly" at "Aug 30, 2001  9:23:28 am"
To: patrick@mip.co.za (Patrick O'Reilly)
Date: Thu, 30 Aug 2001 10:20:42 -0700 (PDT)
Cc: rizzo@aciri.org, freebsd-ipfw@FreeBSD.ORG
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> Agreed - the solution suggested is the way to go.  The question re 1bit/s is
> that according to my observation it did NOT slow down to that rate, but
> continued to allow traffic at a much higher rate, though it did not appear
> to be UNLIMITED.

when i tried it, it really worked as low as 1bit/s. Have you checked
with "ipfw pipe show" to make sure that the speed associated to
the pipe was really 1bit/s and not higher ?

	cheers
	luigi

> This is obviously a moot point as no-one in their right mind (I clearly am
> excluded from that group :) would be using DUMMYNET to actually apply a
> bandwidth limit of 1bit/s.  But, it begs the question: What is the lowest
> bandwidth which can be specified which DUMMYNET will be able to implement
> accurately?
> 
> Anyhow - I don't want to waste any time on this now as an intelligent and
> elegant (and somewhat obvious) solution to my requirement has been given,
> and DUMMYNET has very successfully managed bandwidth down to as low as
> 8kbit/s in my experience.
> 
> Thanks to all for your input!
> 
> Patrick.
> 
> -----Original Message-----
> From: Luigi Rizzo [mailto:rizzo@aciri.org]
> Sent: 29 August 2001 21:18
> To: Patrick O'Reilly
> Cc: freebsd-ipfw@FreeBSD.ORG
> Subject: Re: DUMMYNET
> 
> 
> > Now I have changed cron to simply change the pipe config on the fly :"ipfw
> > pipe x config bw 32Kbit/s" to open it up, and :"ipfw pipe x config bw
> > 1bit/s" to shut it down.  This way my counter values continue to
> > accumulate - GREAT!
> >
> > The problem is that the pipe seems to dislike the idea of running at 1 bit
> > per second.  Obviously this is rather extreme!  Any suggestions on how I
> 
> as someone suggested, adding a rule in front of the pipe solves your
> problem more elegantly. But what is wrong with the pipe at 1 bit/s
> other than leaving packets go out albeit veeeeeery slooooooowly ?
> 
> BTW changing HZ has no observable effect as such low speeds.
> 
> 	cheers
> 	luigi
> 
> 


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