aee7cd82b
Denys Vlasenko
2016-03-04
Subject
ntpd: add experimental patch
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networking/ntpd.diff+24 -0
| @@ -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)) { |