+\subsection options_smpi_bw_factor smpi/bw_factor: Bandwidth factors
+
+The possible throughput of network links is often dependent on the
+message sizes, as protocols may adapt to different message sizes. With
+this option, a series of message sizes and factors are given, helping
+the simulation to be more realistic. For instance, the current
+default value is
+
+\verbatim
+65472:0.940694;15424:0.697866;9376:0.58729;5776:1.08739;3484:0.77493;1426:0.608902;732:0.341987;257:0.338112;0:0.812084
+\endverbatim
+
+So, messages with size 65472 and more will get a total of MAX_BANDWIDTH*0.940694,
+messages of size 15424 to 65471 will get MAX_BANDWIDTH*0.697866 and so on.
+Here, MAX_BANDWIDTH denotes the bandwidth of the link.
+
+\subsection options_smpi_timing smpi/display_timing: Reporting simulation time