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hwclock: refactor processing of PHC readings

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Move processing of PHC readings from sys_linux to hwclock, where
statistics can be collected and filtering improved.

In the PHC refclock driver accumulate the samples even if not in the
external timestamping mode to update the context which will be needed
for improved filtering.
This commit is contained in:
Miroslav Lichvar
2022-06-07 15:03:14 +02:00
parent c23c0b8484
commit 09b7f77f9a
7 changed files with 141 additions and 107 deletions
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26
test/unit/hwclock.c
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@@ -21,18 +21,21 @@
#include <hwclock.c>
#include "test.h"
#define MAX_READINGS 20
void
test_unit(void)
{
struct timespec start_hw_ts, start_local_ts, hw_ts, local_ts, ts;
struct timespec readings[MAX_READINGS][3];
HCL_Instance clock;
double freq, jitter, interval, dj, sum;
int i, j, k, count;
double freq, jitter, interval, dj, err, sum;
int i, j, k, l, n_readings, count;
LCL_Initialise();
for (i = 1; i <= 8; i++) {
clock = HCL_CreateInstance(random() % (1 << i), 1 << i, 1.0);
clock = HCL_CreateInstance(random() % (1 << i), 1 << i, 1.0, 1e-9);
for (j = 0, count = 0, sum = 0.0; j < 100; j++) {
UTI_ZeroTimespec(&start_hw_ts);
@@ -63,10 +66,21 @@ test_unit(void)
UTI_AddDoubleToTimespec(&start_hw_ts, k * interval * freq + TST_GetRandomDouble(-jitter, jitter), &hw_ts);
if (HCL_NeedsNewSample(clock, &local_ts))
HCL_AccumulateSample(clock, &hw_ts, &local_ts, 2.0 * jitter);
if (HCL_NeedsNewSample(clock, &local_ts)) {
n_readings = random() % MAX_READINGS + 1;
for (l = 0; l < n_readings; l++) {
UTI_AddDoubleToTimespec(&local_ts, -TST_GetRandomDouble(0.0, jitter / 10.0), &readings[l][0]);
readings[l][1] = hw_ts;
UTI_AddDoubleToTimespec(&local_ts, TST_GetRandomDouble(0.0, jitter / 10.0), &readings[l][2]);
}
TEST_CHECK(clock->valid_coefs || clock->n_samples < 2);
UTI_ZeroTimespec(&hw_ts);
UTI_ZeroTimespec(&local_ts);
if (HCL_ProcessReadings(clock, n_readings, readings, &hw_ts, &local_ts, &err))
HCL_AccumulateSample(clock, &hw_ts, &local_ts, 2.0 * jitter);
}
TEST_CHECK(clock->valid_coefs == (clock->n_samples >= 2));
if (!clock->valid_coefs)
continue;