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More explainations in the Simple TC doc

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Tom Eastep 2011-01-23 08:36:45 -08:00
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docs/simple_traffic_shaping.xml
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@ -76,22 +76,23 @@
nothing.</para> nothing.</para>
<para>Shorewall's Simple Traffic Shaping configures the prio <para>Shorewall's Simple Traffic Shaping configures the prio
qdisc(rx-prio(8)) on the designated interface then adds an sfq (tc-sfq qdisc(rx-prio(8)) on the designated interface then adds a
(8)) qdisc to each of the classes that are implicitly created for the prio <firstterm>Stochastic Fair Queuing</firstterm> sfq (tc-sfq (8)) qdisc to
qdisc. The sfq qdisc ensures fairness among packets queued in each of the each of the classes that are implicitly created for the prio qdisc. The
classes such that each <firstterm>flow</firstterm> (session) gets its turn sfq qdisc ensures fairness among packets queued in each of the classes
to send packets. The definition of flows can be altered to include all such that each <firstterm>flow</firstterm> (session) gets its turn to send
traffic being sent <emphasis>by</emphasis> a given IP address (normally packets. The definition of flows can be altered to include all traffic
defined for an external interface) or all traffic being sent being sent <emphasis>by</emphasis> a given IP address (normally defined
for an external interface) or all traffic being sent
<emphasis>to</emphasis> a given IP address (internal interface).</para> <emphasis>to</emphasis> a given IP address (internal interface).</para>
<para>Finally, Simple Traffic Shaping allows you to set a limit on the <para>Finally, Simple Traffic Shaping allows you to set a limit on the
total bandwidth allowed out of an interface by inserting a Token Bucket total bandwidth allowed out of an interface. It does this by inserting a
Filter (tbf) qdisc before the prio qdisc. Note that this can have the Token Bucket Filter (tbf) qdisc ahead of the prio qdisc. Note that this
effect of defeating the priority queuing provided by the prio qdisc but can have the effect of defeating the priority queuing provided by the prio
seems to provide a benefit when the actual link output temporarily drops qdisc but seems to provide a benefit when the actual link output
below the limit imposed by tbf or when tbf allows a burst of traffic to be temporarily drops below the limit imposed by tbf or when tbf allows a
released.</para> burst of traffic to be released.</para>
</section> </section>
<section> <section>
@ -124,8 +125,8 @@ eth0 External</programlisting>
<para><emphasis role="bold">Update</emphasis>: Beginning with Shorewall <para><emphasis role="bold">Update</emphasis>: Beginning with Shorewall
4.4.7, Shorewall can determine that some environments, such as RHEL5 and 4.4.7, Shorewall can determine that some environments, such as RHEL5 and
derivatives, are incapable of using the TYPE parameter and simply derivatives, are incapable of using the TYPE parameter and simply ignore
ignores it.</para> it.</para>
</note> </note>
<para>With this simple configuration, packets to be sent through interface <para>With this simple configuration, packets to be sent through interface