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ntp: fix time smoothing in interleaved mode

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When the server's transmit timestamp was updated with a kernel/HW
timestamp, it didn't include the time smoothing offset. If the offset
was larger than one second, the update failed and clients using the
interleaved mode received less accurate timestamps. If the update
succeeded, the clients received timestamps that were not adjusted for
the time smoothing offset, which added an error of up to 0.5s/1s to
their measured offset/delay.

Fix the update to include the smoothing offset in the new timestamp.
This commit is contained in:
Miroslav Lichvar
2017-01-20 13:17:45 +01:00
parent 4b98dadae9
commit da2d33e9a8
1 changed files with 3 additions and 0 deletions
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3
ntp_core.c
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@@ -2036,6 +2036,9 @@ NCR_ProcessTxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
if (log_index < 0)
return;
if (SMT_IsEnabled() && NTP_LVM_TO_MODE(message->lvm) == MODE_SERVER)
UTI_AddDoubleToTimespec(&tx_ts->ts, SMT_GetOffset(&tx_ts->ts), &tx_ts->ts);
CLG_GetNtpTimestamps(log_index, &local_ntp_rx, &local_ntp_tx);
UTI_Ntp64ToTimespec(local_ntp_tx, &local_tx.ts);