From: Stef Coene <stef.coene@docum.org>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] Unclarified issue
Date: Mon, 12 May 2003 19:18:48 +0000 [thread overview]
Message-ID: <marc-lartc-105276907923157@msgid-missing> (raw)
In-Reply-To: <marc-lartc-105274679628578@msgid-missing>
On Monday 12 May 2003 15:35, Peter Rabbitson wrote:
> Hi all,
> Just finished reading and re-reading the advanced routing how-to. This this
> is marvelous!!! Thank you all that spent your time and devoted it to such a
> great paper! However there is something that I am missing from the picture.
> By default each interface is bundled with the pfifo_fast that prioritizes
> the packets based on TOS. If for say we do this: # tc qdisc add dev eth0
> root tbf rate 100kbit latency 100ms urst 2048 Do we actually lose the whole
> point of TOS? Or there is stil an underlying filter somewhere in the kernel
> that will take care of the TOS scheduling just like pfifo_fast did?
You loose the TOS settings.
> Also in the following example:
> # tc qdisc add dev eth0 root handle 1: prio
> We automatically create three handles 1:1 1:2 1:3, with the default
> priomap. However what happens to traffic that goes down 1:1 if there is no
> qdisc attached to it? Does it get dequeued right off the back or there is
> again something similar to pfifo_fast waiting for it?
There is always a qdisc responsible for sending the packets. If you add a
prio qdisc, you also created 3 small fifo qdiscs for each class.
If you want some example shaping scripts (mostly cbq and htb), you can go to
docum.org.
Stef
--
stef.coene@docum.org
"Using Linux as bandwidth manager"
http://www.docum.org/
#lartc @ irc.oftc.net
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next prev parent reply other threads:[~2003-05-12 19:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-12 13:35 [LARTC] Unclarified issue Peter Rabbitson
2003-05-12 19:18 ` Stef Coene [this message]
2003-05-12 21:08 ` Peter Rabbitson
2003-05-13 17:13 ` Stef Coene
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