Graphical output

Filtered output can be further processed with the script tcsim_plot, which uses gnuplot to generate plots.

Usage:

tcsim_plot $[$-a samples$]$ $[$-j$]$ $[$-m$]$ $[$-p ps_file$\vert$-jpeg jpeg_file$\vert$-png png_file$]$ $[$-t plot_type$]$ $[$-cmd gnuplot_command $\ldots$$]$ $[$file $\ldots]$

-a samples

Average over the number of samples

-j

Time is in jiffies, not seconds (i.e. tcsim was run with -j)

-m

Generate monochrome output

-cmd gnuplot_command

Send command to gnuplot before plotting

-p ps_file

Generate Postscript output

-jpeg jpeg_file

Generate JPEG output

-png png_file

Generate PNG (Portable Network Graphics) output

-t plot_type

Specifies the plot type

If the file name for -p, -jpeg, or -png is -, tcsim_plot writes the data to standard output and suppresses forwarding of tcsim_filter snapshots.

The following plot types are available:

rate

Bit rate (based on the inter-arrival time)

iat

Packet inter-arrival time

cumul

Cumulative amount of data

delay

Queuing delay, measured at dequeue time

rate and iat normally require averaging in order to produce useful results. With rate, packets apparently arriving at the same time are treated like one large packet arriving at that time.

Examples:

tcsim examples/dsmark+policing | tcsim_filter | \
  tcsim_plot -t cumul

tcsim examples/dsmark+policing | tcsim_filter | \
  tcsim_plot -a 10

tcsim examples/ef-prio | tcsim_filter tos | \
  tcsim_plot -t delay