5.75 TIMERINT (Internal timer update interval)
5.75.1 Function
The TIMERINT parameter sets the internal timer update interval in microseconds. This parameter speci-
fies how frequently Hercules's internal timers-update thread updates the TOD clock, CPU Timer and other
architectural related clock/timer values.
The default interval is 50 microseconds which strikes a reasonable balance between clock accuracy and
overall host performance. The minimum allowed value is 1 microsecond and the maximum is 1,000,000
microseconds (one second).
CAUTION: While a lower TIMERINT value may help increase the accuracy of the guest's TOD clock and
CPU Timer values it could also have severe negative impact on the overall performance of the host
operating system. This is especially true when a low TIMERINT value is coupled with a high HERCPRIO
and TODPRIO priority setting. Exercise extreme caution when choosing your desired TIMERINT in re-
lationship to your chosen HERCPRIO and TODPRIO priority settings.
5.75.2 Syntax
Descriptive
Diagram
¬¬¬¬¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬ÊÍ
5.75.3 Parameter
interval
Specifies the timer update interval in microseconds. The minimum allowed value for
the interval is 1 microsecond and the maximum is 1'000'000 microseconds (one se-
cond.
CAUTION: While a lower TIMERINT value may help increase the accuracy of the
guest's TOD clock and CPU Timer values, it could also have severe negative im-
pact on the overall performance of the host operating system. This is especially
true when a low value is coupled with a high HERCPRIO and TODPRIO priority
setting.
Exercise extreme caution when choosing your desired TIMERINT in relationship to
your chosen HERCPRIO and TODPRIO priority settings.
interval
Specifies the timer update interval in microseconds. The minimum allowed value for
the interval is 1 microsecond and the maximum is 1,000,000 microseconds (one
second).
