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| author | Denys Vlasenko | 2016-03-04 07:36:04 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2016-03-04 07:36:04 +0100 |
| commit | aee7cd82be31577c2e5c144d083af206bedbb96a (patch) | |
| tree | ca0fe0bcb0274a44a755f558ea5257870dbd1ff5 | |
| parent | c8641962e4cbde48108ddfc1c105e3320778190d (diff) | |
| download | busybox-aee7cd82be31577c2e5c144d083af206bedbb96a.zip busybox-aee7cd82be31577c2e5c144d083af206bedbb96a.tar.gz | |
ntpd: add experimental patch
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | networking/ntpd.diff | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/networking/ntpd.diff b/networking/ntpd.diff new file mode 100644 index 0000000..4afd7e1 --- /dev/null +++ b/networking/ntpd.diff @@ -0,0 +1,24 @@ +This patch scales down small offsets quadratically. Reduces sensitivity to jitter + +diff --git a/networking/ntpd.c b/networking/ntpd.c +index 4695c33..ac05815 100644 +--- a/networking/ntpd.c ++++ b/networking/ntpd.c +@@ -1654,6 +1654,17 @@ update_local_clock(peer_t *p) + */ + if (G.offset_to_jitter_ratio >= TIMECONST_HACK_GATE) + tmx.constant--; ++ ++{ ++ double d = p->lastpkt_delay; ++ if (d > SLEW_THRESHOLD) ++ d = SLEW_THRESHOLD; ++ d /= 2; ++ if ((abs_offset / d) < 1) { ++ offset *= (abs_offset / d); ++ } ++} ++ + tmx.offset = (long)(offset * 1000000); /* usec */ + if (SLEW_THRESHOLD < STEP_THRESHOLD) { + if (tmx.offset > (long)(SLEW_THRESHOLD * 1000000)) { |