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timer/epit: limit timeout rate

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Limit rate to 1000 per second as it raises the throughput under stress
significantly without having an effect on the tested accuracy.

Issue #2579
This commit is contained in:
Alexander Boettcher 2017-11-24 09:34:00 +01:00 committed by Christian Helmuth
parent c63fe241f4
commit c9bcce57e8
1 changed files with 5 additions and 6 deletions
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11
repos/os/src/drivers/timer/epit/time_source.cc
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@ -25,10 +25,6 @@ Microseconds Timer::Time_source::max_timeout() const {
void Timer::Time_source::schedule_timeout(Microseconds duration,
Timeout_handler &handler)
{
/* make swift current time steady */
Duration const time = curr_time();
_curr_time_us = time.trunc_to_plain_us().value;
/*
* Program max timeout in case of duration 0 to avoid lost of accuracy
* due to wraps when value is chosen too small. Send instead a signal
@ -57,10 +53,13 @@ Duration Timer::Time_source::curr_time()
unsigned const tic_value = _epit.value(wrapped);
unsigned passed_tics = 0;
if (wrapped)
if (_irq && wrapped)
passed_tics += max_value;
passed_tics += max_value - tic_value;
return Duration(Microseconds(_curr_time_us + _epit.tics_to_us(passed_tics)));
if (_irq || _epit.tics_to_us(passed_tics) > 1000)
_curr_time_us += _epit.tics_to_us(passed_tics);
return Duration(Microseconds(_curr_time_us));
}