A página de manual de pulse-daemon.conf
diz:
DEFAULT FRAGMENT SETTINGS
Some hardware drivers require the hardware playback buffer to be subdivided into several frag‐
ments. It is possible to change these buffer metrics for machines with high scheduling laten‐
cies. Not all possible values that may be configured here are available in all hardware. The
driver will find the nearest setting supported. Modern drivers that support timer-based sched‐
uling ignore these options.
default-fragments= The default number of fragments. Defaults to 4.
default-fragment-size-msec=The duration of a single fragment. Defaults to 25ms (i.e. the total
buffer is thus 100ms long).