Date: Fri, 31 Aug 2001 09:03:15 +0200 From: "Patrick O'Reilly" <patrick@mip.co.za> To: "Luigi Rizzo" <rizzo@aciri.org> Cc: <freebsd-ipfw@FreeBSD.ORG> Subject: RE: DUMMYNET Message-ID: <NDBBIMKICMDGDMNOOCAIOEGLDGAA.patrick@mip.co.za> In-Reply-To: <200108301720.f7UHKge32432@iguana.aciri.org>
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Luigi, I'll test further. I did use 'ipfw pipe list' to verify the 'bw' setting, and it was '1bit/s'. Yet, there were packets passing through the pipeline at the rate of two or three tcp setup packets per second, which must be at the very least 100bit/s, perhaps more. Anyway Luigi, I appreciate your time in responding, and I really don't want you to waste any time on this issue which is so close to the edges of sanity! Thanks, Patrick. -----Original Message----- From: Luigi Rizzo [mailto:rizzo@aciri.org] Sent: 30 August 2001 19:21 To: Patrick O'Reilly Cc: rizzo@aciri.org; freebsd-ipfw@FreeBSD.ORG Subject: Re: DUMMYNET > 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 > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-ipfw" in the body of the message
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