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ntp: improve dispersion calculation

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Instead of adding precision (sum of the local and remote precision) to
the TX and RX timestamp error, include only the maximum.
This commit is contained in:
Miroslav Lichvar 2017-01-04 15:40:52 +01:00
parent ab99373cfc
commit 96cc80ffc8
1 changed files with 2 additions and 1 deletions
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3
ntp_core.c
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@ -1435,7 +1435,8 @@ receive_packet(NCR_Instance inst, NTP_Local_Address *local_addr,
skew = (source_freq_hi - source_freq_lo) / 2.0;
/* and then calculate peer dispersion */
dispersion = precision + inst->local_tx.err + rx_ts_err + skew * fabs(local_interval);
dispersion = MAX(precision, MAX(inst->local_tx.err, rx_ts_err)) +
skew * fabs(local_interval);
/* Additional tests required to pass before accumulating the sample */