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ntp: use monotonic time for replacement interval

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Avoid errors in the measured interval due to clock steps.
This commit is contained in:
Miroslav Lichvar
2023-06-06 10:40:51 +02:00
parent 05809e937c
commit ab8da7ecb9
1 changed files with 5 additions and 6 deletions
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11
ntp_sources.c
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@@ -1006,11 +1006,10 @@ resolve_source_replacement(SourceRecord *record, int refreshment)
void void
NSR_HandleBadSource(IPAddr *address) NSR_HandleBadSource(IPAddr *address)
{ {
static struct timespec last_replacement; static double last_replacement = -1e6;
struct timespec now;
SourceRecord *record; SourceRecord *record;
IPAddr ip_addr; IPAddr ip_addr;
double diff; double now;
int slot; int slot;
if (!find_slot(address, &slot)) if (!find_slot(address, &slot))
@@ -1025,9 +1024,9 @@ NSR_HandleBadSource(IPAddr *address)
return; return;
/* Don't resolve names too frequently */ /* Don't resolve names too frequently */
SCH_GetLastEventTime(NULL, NULL, &now); now = SCH_GetLastEventMonoTime();
diff = UTI_DiffTimespecsToDouble(&now, &last_replacement); if (now - last_replacement <
if (fabs(diff) < RESOLVE_INTERVAL_UNIT * (1 << MIN_REPLACEMENT_INTERVAL)) { RESOLVE_INTERVAL_UNIT * (1 << MIN_REPLACEMENT_INTERVAL)) {
DEBUG_LOG("replacement postponed"); DEBUG_LOG("replacement postponed");
return; return;
} }