rdisp/ext_timer_stop_delay is a SAP Parameter attribute which is used to control information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
The VMC (Virtual Machine Container) offers the optio to record the
process flow of applications using time sampling. The affected VMs must
be requested to write the necessary data during execution by events.
Since these events must be triggered in a finely-granulated way, this
takes place by an external process that is started before the recording
begins. After completing a measurement, the process is then ended again
with a certain delay.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.