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authorKay Sievers <kay@vrfy.org>2014-03-16 23:51:50 +0100
committerKay Sievers <kay@vrfy.org>2014-03-16 23:51:50 +0100
commita47b9e628367eb39ce00c3774e2b6488684fe6c0 (patch)
tree3eebca574a48a1c717329f8874914e521a29e843 /src
parent3dbc7620030b7eacfe19d55f1bcd8237dd3230ef (diff)
timedated: update spike handling
Diffstat (limited to 'src')
-rw-r--r--src/timedate/timedate-sntp.c26
1 files changed, 13 insertions, 13 deletions
diff --git a/src/timedate/timedate-sntp.c b/src/timedate/timedate-sntp.c
index fff02c79e5..7e34e93ca6 100644
--- a/src/timedate/timedate-sntp.c
+++ b/src/timedate/timedate-sntp.c
@@ -404,18 +404,6 @@ static bool sntp_sample_spike_detection(SNTPContext *sntp, double offset, double
sntp->packet_count++;
jitter = sntp->samples_jitter;
- /* ignore samples when resyncing */
- if (sntp->poll_resync)
- return false;
-
- /* we need a few samples before we calculate anything */
- if (sntp->packet_count < 3)
- return false;
-
- /* always accept sample if we are farther off than the round trip delay */
- if (fabs(offset) > delay)
- return false;
-
/* calculate new jitter value from the RMS differences relative to the lowest delay sample */
for (idx_min = idx_cur, i = 0; i < ELEMENTSOF(sntp->samples); i++)
if (sntp->samples[i].delay > 0 && sntp->samples[i].delay < sntp->samples[idx_min].delay)
@@ -426,8 +414,20 @@ static bool sntp_sample_spike_detection(SNTPContext *sntp, double offset, double
j += square(sntp->samples[i].offset - sntp->samples[idx_min].offset);
sntp->samples_jitter = sqrt(j / (ELEMENTSOF(sntp->samples) - 1));
+ /* ignore samples when resyncing */
+ if (sntp->poll_resync)
+ return false;
+
+ /* always accept offset if we are farther off than the round-trip delay */
+ if (fabs(offset) > delay)
+ return false;
+
+ /* we need a few samples before looking at them */
+ if (sntp->packet_count < 4)
+ return false;
+
/* do not accept anything worse than the maximum possible error of the best sample */
- if (abs(offset) > sntp->samples[idx_min].delay)
+ if (fabs(offset) > sntp->samples[idx_min].delay)
return true;
/* compare the difference between the current offset to the previous offset and jitter */