Date: Fri, 11 Sep 1998 15:11:21 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: oppermann@pipeline.ch (Andre Oppermann) Cc: dennis@etinc.com, mike@smith.net.au, ulf@Alameda.net, hackers@FreeBSD.ORG Subject: Re: Packet/traffic shapper ? Message-ID: <199809111311.PAA19937@labinfo.iet.unipi.it> In-Reply-To: <35F92CE3.BC7AF153@pipeline.ch> from "Andre Oppermann" at Sep 11, 98 03:59:44 pm
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> > I suppose that you mean "the 2 best free solutions"?
>
> No, until you give me more technically detailed description of your
> BW manager product.
well still it is not a free solution so the comment is correct :)
>From what i have read about the Etinc product (and i'll be happy
to be corrected), it does something very similar to the
bandwidth-management part of dummynet, plus comes with support
being commercial software.
> What I look for is an alternative for the standard FIFO queueing
> currently done in the BSD IP stack. You might know that bandwidth
> is quite expensive here in Europe and I'd like to drive my links
> up to 90% utilization. That is only possible if I have something
> like RED that does fair queueing on the FreeBSD routers, otherwise
ALTQ might be for you then. In fact RED+WFQ would be not hard to
port to dummynet (and it is in my todo list but not at the top),
and the bw limiting of dummynet could be ported even more easily
to ALTQ, but there is one little difference between ALTQ and
dummynet:
* ALTQ replaces the queueing management at the interface level,
so it has more feedback from the interface, at the price of having
to modify/recompile each driver.
* dummynet works at a higher level so the bandwidth is configured
"statically" and you can have queueing underneath. The advantage is
that you don't have to recompile the drivers, dummynet works even
on a ppp link.
I have to say that if your machine is not directly on the bottleneck
link, or such link has constant bandwidth (e.g. does not use
compression etc.) then the difference is irrelevant apart from long
term drifts (but you can easily correct them).
It remains as a fact that, as it is now, ALTQ implements WFQ and RED,
whereas dummynet does not.
cheers
luigi
-----------------------------+--------------------------------------
Luigi Rizzo | Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it | Universita' di Pisa
tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/
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