Date: Fri, 09 Jun 2000 23:37:33 +0100 From: Brian Somers <brian@Awfulhak.org> To: Adam <bsdx@looksharp.net> Cc: net@FreeBSD.ORG, brian@hak.lan.Awfulhak.org Subject: Re: HEADS UP- WF2Q and RED now available in -current Message-ID: <200006092237.XAA00463@hak.lan.Awfulhak.org> In-Reply-To: Message from Adam <bsdx@looksharp.net> of "Fri, 09 Jun 2000 16:43:07 EDT." <Pine.BSF.4.21.0006091640310.96469-100000@turtle.looksharp.net>
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> On Fri, 9 Jun 2000, Peter Wemm wrote:
> >Thierry Herbelot wrote:
> >> "Gary T. Corcoran" wrote:
> >> >
> >> > Luigi,
> >> >
> >> > > as the subject says, i have just committed some new code to
> >> > > dummynet (and related hooks and documentation for ipfw) to
> >> > > implement RED (thanks to Gianluca Iannaccone) and a
> >> > > variant of Weighted Fair Queueing called WF2Q+
> >> >
> >> > I checked your web page, but didn't find anything describing
> >> > what "RED" is. And I'm afraid if I just put "red" into a
> >> > search engine I'll get a zillion results... ;-)
> >> >
> >> > So could you just very briefly explain what "RED" is, and/or
> >> > point me to a URL which describes it?
> >>
> >> Random Early Discard : if the channel has not enough bandwidth, just
> >> throw away some frames (randomly)
> >
> >More to the point, it takes advantage of TCP backoff to slow down all the
> >TCP sessions so that you don't quite get to the point of hitting the 100%
> >limit and losing a large chunk of in-flight data. If you drop a few packets
> >earlier you can "shape" the tcp connection(s) so that they don't hit the
> >wall hard.
> >
> >Cheers,
> >-Peter
>
> This sounds like _exactly_ what I need for my link :) Anyone have any
> information on how to set that up? It might just be enough reason to
> upgrade my firewall ;>
Luigi's description started this thread :-) Briefly:
: In order to test WFQ you can try the following:
:
: ipfw add 100 queue 10 icmp from any to any out
: ipfw add 200 queue 11 ip from any to any out
:
: ipfw queue 10 config weight 1 pipe 2
: ipfw queue 11 config weight 10 pipe 2 mask all
:
: ipfw pipe 2 config bw 200Kbit/s
:
: and then see how a ping -f to the outside will not disturb
: other IP traffic, while still being able to use the full bandwidth
: configured for the pipe.
--
Brian <brian@Awfulhak.org> <brian@[uk.]FreeBSD.org>
<http://www.Awfulhak.org>; <brian@[uk.]OpenBSD.org>
Don't _EVER_ lose your sense of humour !
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