networking/ntpd.diff

   1 This patch scales down small offsets quadratically. Reduces sensitivity to jitter
   2
   3 diff --git a/networking/ntpd.c b/networking/ntpd.c
   4 index 4695c33..ac05815 100644
   5 --- a/networking/ntpd.c
   6 +++ b/networking/ntpd.c
   7 @@ -1654,6 +1654,17 @@ update_local_clock(peer_t *p)
   8          */
   9         if (G.offset_to_jitter_ratio >= TIMECONST_HACK_GATE)
  10                 tmx.constant--;
  11 +
  12 +{
  13 +    double d = p->lastpkt_delay;
  14 +    if (d > SLEW_THRESHOLD)
  15 +       d = SLEW_THRESHOLD;
  16 +    d /= 2;
  17 +    if ((abs_offset / d) < 1) {
  18 +        offset *= (abs_offset / d);
  19 +    }
  20 +}
  21 +
  22         tmx.offset = (long)(offset * 1000000); /* usec */
  23         if (SLEW_THRESHOLD < STEP_THRESHOLD) {
  24                 if (tmx.offset > (long)(SLEW_THRESHOLD * 1000000)) {