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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.
.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
.BR tc (8)
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
at most 70ms of latency, with perfect peakrate behaviour, issue:
.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 \\
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
.BR tc (8)