1tswtclmt(7ipp)           IP Quality of Service Modules          tswtclmt(7ipp)
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NAME

6       tswtclmt - Time Sliding Window Three Conformance Level Meter
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DESCRIPTION

9       The Time Sliding Window Three Conformance level meter (tswtcl) meters a
10       traffic stream and determines the conformance level of its packets.
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13       Packets are deemed to belong to one of the three levels, Red, Yellow or
14       Green, depending on the committed and peak rate.
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17       The  meter  provides  an  estimate of the running average bandwidth. It
18       takes into account burstiness and smoothes out its estimate to  approx‐
19       imate the longer-term measured sending rate of the traffic  stream.
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22       The  estimated  bandwidth approximates the running average bandwidth of
23       the traffic stream over a specific window (time interval). tswtcl esti‐
24       mates the average bandwidth using a time-based estimator. When a packet
25       arrives for a class, tswtcl re-computes the average rate by  using  the
26       rate  in  the  last window (time interval) and the size of the arriving
27       packet. The window is then slid to  start  at  the  current  time  (the
28       packet  arrival  time). If the computed rate is less than the committed
29       configuration parameter, the packet is deemed Green; else if  the  rate
30       is  less  than the peak rate, it is Yellow; else Red. To avoid dropping
31       multiple packets within a TCP window, tswtcl probabilistically  assigns
32       one of the three conformance level to the packet.
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STATISTICS

35       The  tswtcl  module  exports  global  and  per-class statistics through
36       kstat:
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39       Global statistics:
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41         module: tswtclmt                         instance: <action id>
42           name: tswtclmt statistics              class <action name>
43                 green_bits                      <number of bit in green>
44                 green_packets                   <number of packets in green>
45                 red_bits                        <number of bits in red>
46                 red_packets                     <number of packets in red>
47                 yellow_bits                     <number of bits in yellow>
48                 yellow_packets                  <number of packets in yellow>
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FILES

52       /kernel/ipp/sparcv9/tswtclmt
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54           64-bit module (SPARC only.)
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ATTRIBUTES

58       See attributes(5) for descriptions of the following attributes:
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63       ┌─────────────────────────────┬─────────────────────────────┐
64       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
65       ├─────────────────────────────┼─────────────────────────────┤
66       │Availability                 │SUNWqos                      │
67       └─────────────────────────────┴─────────────────────────────┘
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SEE ALSO

70       ipqosconf(1M),     dlcosmk(7ipp),     dscpmk(7ipp),     flowacct(7ipp),
71       ipqos(7ipp), ipgpc(7ipp), tokenmt(7ipp)
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74       RFC  2859,  A Time Sliding Window Three Colour Marker (TSWTCM) W. Fang,
75       N. Seddigh, B. Nandy — The Internet Society, 2000
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79SunOS 5.11                        29 Sep 2004                   tswtclmt(7ipp)
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