'\" te
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.TH TSWTCLMT 4IPP "Sep 29, 2004"
.SH NAME
tswtclmt \- Time Sliding Window Three Conformance Level Meter
.SH DESCRIPTION
.sp
.LP
The Time Sliding Window Three Conformance level meter (\fBtswtcl\fR) meters a
traffic stream and determines the conformance level of its packets.
.sp
.LP
Packets are deemed to belong to one of the three levels, Red, Yellow or Green,
depending on the committed and peak rate.
.sp
.LP
The meter provides an estimate of the running average bandwidth. It takes into
account burstiness and smoothes out its estimate to  approximate the
longer-term measured sending rate of the traffic  stream.
.sp
.LP
The estimated bandwidth approximates the running average bandwidth of the
traffic stream over a specific window (time interval). \fBtswtcl\fR estimates
the average bandwidth using a time-based estimator. When a packet arrives for a
class, \fBtswtcl\fR re-computes the average rate by using the rate in the last
window (time interval) and the size of the arriving packet. The window is then
slid to start at the current time (the packet arrival time). If the computed
rate is less than the committed configuration parameter, the packet is deemed
Green; else if the rate is less than the peak rate, it is Yellow; else Red. To
avoid dropping multiple packets within a TCP window, \fBtswtcl\fR
probabilistically assigns one of the three conformance level to the packet.
.SH STATISTICS
.sp
.LP
The \fBtswtcl\fR module exports global and per-class statistics through kstat:
.sp
.LP
Global statistics:
.sp
.in +2
.nf
module: tswtclmt                         instance: <action id>
  name: tswtclmt statistics              class <action name>
        green_bits                      <number of bit in green>
        green_packets                   <number of packets in green>
        red_bits                        <number of bits in red>
        red_packets                     <number of packets in red>
        yellow_bits                     <number of bits in yellow>
        yellow_packets                  <number of packets in yellow>
.fi
.in -2

.SH FILES
.sp
.ne 2
.na
\fB\fB/kernel/ipp/sparcv9/tswtclmt\fR\fR
.ad
.sp .6
.RS 4n
64-bit module (SPARC only.)
.RE

.SH SEE ALSO
.sp
.LP
.BR dlcosmk (4IPP),
.BR dscpmk (4IPP),
.BR flowacct (4IPP),
.BR ipgpc (4IPP),
.BR ipqos (4IPP),
.BR tokenmt (4IPP),
.BR ipqosconf (8)
.sp
.LP
\fIRFC 2859, A Time Sliding Window Three Colour Marker (TSWTCM)\fR W. Fang, N.
Seddigh, B. Nandy \(em The Internet Society, 2000