Martin A. Brown wrote:
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Vadtec,
I think you may be making two of the most common problems facing
novices working with traffic control, so I hope you don't mind my
picking on you!
Not at all. :)
Problem #0
- ----------
You are applying your shaping on the outbound traffic (presuming
that "$IFext" is your external interface. Unless you also have
shaping on your inbound traffic ("$IFint"?), then you are only
applying shaping characteristics to the upload traffic. This brings
us back to two fundamental rules of traffic shaping:
$IFext is eth0, and is my link to my DSL Modem. $IFint would be eth1,
which is my interface
to my LAN (though I am not shaping traffic on it in any way). Both of
these devices plug into
my 24 port switch, which the DSL modem is hooked into, as well as all
the other computers in
the house.
So just for clarity sake, here are the port assignments on the switch:
Port 1 - DSL Modem uplink
Port 2 - $IFext (eth0) on my router PC
Port 3 - $IFint (eth1) on my router PC
Port 4 - My laptop
Port 5 - My brothers PC
Port 6/25 - Unused currently, but used at random as needed.
* For optimal results, your shaping device should be the
bottleneck, so that it can act as the traffic flow valve.
* You can only shape what you transmit. If your edge device is
performing shaping, then it should shape upload traffic by a
policy applied to the external interface and it should shape
download traffic by policy applied to the internal interface.
In short, add a similar set of HTB + SFQ queues to your internal
interface, along with the appropriate classifiers and try again.
So you are saying I have to not only do traffic shaping, but also
traffic policing on my internal device?
Or do I have to do traffic shaping on both devices and no traffic
policing? In other words, how much
traffic shaping/policing do I need to put into effect, and on which
interfaces.
: While I understand how/why TC enforces minimum bandwidth for a
: given class, why is it that for class 100 TC is not enforcing the
: cap of 20kbps to traffic that it is classified at? Is there
: something else I need to do to make TC also enforce arbitrary
: maximum limits for a given classification?
:
: I am on DSL internet with rates 1.5Mbps/384kbps.
That 1.5Mbps (conventional networking terminology and units) is
written as 1.5Mbit in terms used by tc.
Problem #1
- ----------
I think you may be making an error in your units. This is one of
the most frequent problems when people start using "tc". Since "tc"
sprang from the primordial soup, the following units are used:
bps = bytes per second
bit = bits per second
The unfortunate problem with this marking for units is that we say
many other places in networking that bits per second is bps. This
is not true with tc. So, if I look at your rate specifications
below, they look off by a factor of 8. Please try altering all
instances of "kbps" to "kbit" and try your script again. See also
these URLs [0] [1] [2].
So, what you are saying is, its just a matter of different naming. In
essence,
368kbps (conventional) is the same as 368kbit (tc), right?
: I do not make complete use of my pipe just in case of a massive
: burst. I know I will probably not burst such a massive burst, but
: its better to be safe than sorry.
This is wise.
:)
: Class 90 is the default. Class 100 is a special class, and what
: my question specifically relates to. Class 100 is for bit
: torrent. I do not like the other people in my house using very
: much bandwidth for torrenting as it has a tendency to slow things
: down to greatly.
If you place FIFOs in any of your HTB leaf classes, you can vary the
depth of the FIFO queue to help control latency, in addition to that
class's total throughput. This is a cheap and dirty way to
accomplish this task.
I have no idea what that means. How do I vary the depth of the FIFO to
help control latency?
: The problem I have is this: when I disable a given torrent
: clients upload limits, the bandwidth climbs to above the 20kbps
: limit I have set for it. When I classify the traffic in iptables,
: i put it into class 100, so it shouldn't getting put into the
: default class.
While you are starting and stopping your torrent client, you should
also take a look at the class statistics:
watch -n 1 tc -s class show dev $INTERFACE_NAME
This will allow you to see which class is being used to carry that
traffic.
I ran both watch -n 1 tc -s class show dev eth0 and watch -n 1 tc -s
qdisc show eth0.
(When I ran class show, i did not have enough room to see classes 80 and
90. When I ran qdisc
show, I was able to see all the classes.) During my runs of tc in this
manner, I saw zero traffic going
to class 100 when running, starting, or stopping bit torrent. Almost all
the traffic was going to class 10
and 90 (default) with the exception of my ICMP and UDP traffic which was
going to class 70 and
class 60 which I have set aside for IRC traffic. Class 100 saw
absolutely zero traffic.
Is this a case where the default class (90) is getting all the traffic
because it can handle it as my LAN
has very little "other" traffic most of the time to deal with, so there
is no need to throttle it back?
If so, how can I force a particular class to be used regardless of the
default,
so that I can control individual apps by them selves?
Good luck,
- -Martin
[0] http://www.docum.org/docum.org/faq/cache/74.html
[1] http://mailman.ds9a.nl/pipermail/lartc/2003q4/010826.html
[2] http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm
- --
Martin A. Brown
http://linux-ip.net/
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Thank you for your help!
Vadtec
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