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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
parent 7b73323301
commit 228eeabb7d
1 changed files with 16 additions and 15 deletions
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docs/simple_traffic_shaping.xml
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@ -76,22 +76,23 @@
nothing.</para>
<para>Shorewall's Simple Traffic Shaping configures the prio
qdisc(rx-prio(8)) on the designated interface then adds an sfq (tc-sfq
(8)) qdisc to each of the classes that are implicitly created for the prio
qdisc. The sfq qdisc ensures fairness among packets queued in each of the
classes such that each <firstterm>flow</firstterm> (session) gets its turn
to send packets. The definition of flows can be altered to include all
traffic being sent <emphasis>by</emphasis> a given IP address (normally
defined for an external interface) or all traffic being sent
qdisc(rx-prio(8)) on the designated interface then adds a
<firstterm>Stochastic Fair Queuing</firstterm> sfq (tc-sfq (8)) qdisc to
each of the classes that are implicitly created for the prio qdisc. The
sfq qdisc ensures fairness among packets queued in each of the classes
such that each <firstterm>flow</firstterm> (session) gets its turn to send
packets. The definition of flows can be altered to include all traffic
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>
<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
Filter (tbf) qdisc before the prio qdisc. Note that this can have the
effect of defeating the priority queuing provided by the prio qdisc but
seems to provide a benefit when the actual link output temporarily drops
below the limit imposed by tbf or when tbf allows a burst of traffic to be
released.</para>
total bandwidth allowed out of an interface. It does this by inserting a
Token Bucket Filter (tbf) qdisc ahead of the prio qdisc. Note that this
can have the effect of defeating the priority queuing provided by the prio
qdisc but seems to provide a benefit when the actual link output
temporarily drops below the limit imposed by tbf or when tbf allows a
burst of traffic to be released.</para>
</section>
<section>
@ -124,8 +125,8 @@ eth0 External</programlisting>
<para><emphasis role="bold">Update</emphasis>: Beginning with Shorewall
4.4.7, Shorewall can determine that some environments, such as RHEL5 and
derivatives, are incapable of using the TYPE parameter and simply
ignores it.</para>
derivatives, are incapable of using the TYPE parameter and simply ignore
it.</para>
</note>
<para>With this simple configuration, packets to be sent through interface