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TBF man page fix (tbf is not classless) 

TBF is not classless qdisc. man page corrected, added example
describing the use of inner qdisc

Signed-off-by: Sergey V. Lobanov <sergey@lobanov.in>
This commit is contained in:
Sergey V. Lobanov 2014-05-09 22:12:54 +04:00 committed by Stephen Hemminger
parent 96e8ab7c58
commit 7bc7fcaadb
1 changed files with 10 additions and 2 deletions
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12
man/man8/tc-tbf.8
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@ -21,7 +21,7 @@ bytes/cell
burst is also known as buffer and maxburst. mtu is also known as minburst. burst is also known as buffer and maxburst. mtu is also known as minburst.
.SH DESCRIPTION .SH DESCRIPTION
The Token Bucket Filter is a classless queueing discipline available for The Token Bucket Filter is a classful queueing discipline available for
traffic control with the traffic control with the
.BR tc (8) .BR tc (8)
command. command.
@ -121,9 +121,17 @@ To attach a TBF with a sustained maximum rate of 0.5mbit/s, a peakrate of 1.0mbi
a 5kilobyte buffer, with a pre-bucket queue size limit calculated so the TBF causes a 5kilobyte buffer, with a pre-bucket queue size limit calculated so the TBF causes
at most 70ms of latency, with perfect peakrate behaviour, issue: at most 70ms of latency, with perfect peakrate behaviour, issue:
.P .P
# tc qdisc add dev eth0 root tbf rate 0.5mbit \\ # tc qdisc add dev eth0 handle 10: root tbf rate 0.5mbit \\
burst 5kb latency 70ms peakrate 1mbit \\ burst 5kb latency 70ms peakrate 1mbit \\
minburst 1540 minburst 1540
.P
To attach an inner qdisc, for example sfq, issue:
.P
# tc qdisc add dev eth0 parent 10:1 handle 100: sfq
.P
Without inner qdisc TBF queue acts as bfifo. If the inner qdisc is changed
the limit/latency is not effective anymore.
.P
.SH SEE ALSO .SH SEE ALSO
.BR tc (8) .BR tc (8)