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busybox: ntpd: increase SLEW_THRESHOLD from 0.125 to 0.5 (backport)

Original commit: 8502fa8747e962f69084be09ff8b930e0fb0c449
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Denys Vlasenko authored and RMerl committed May 13, 2019
1 parent 0faeab4 commit 2a95dd451466df36c902fa97ac13c7219c58d8d7
Showing with 4 additions and 6 deletions.
  1. +4 −6 release/src/router/busybox/networking/ntpd.c
@@ -138,13 +138,11 @@
*/
#define STEP_THRESHOLD 1
/* Slew threshold (sec): adjtimex() won't accept offsets larger than this.
* Using exact power of 2 (1/8) results in smaller code
* Using exact power of 2 (1/8, 1/2 etc) results in smaller code
*/
#define SLEW_THRESHOLD 0.25
/* Stepout threshold (sec). std ntpd uses 900 (11 mins (!)) */
//^^^^^^^^^^^^^^^^^^^^^^^^^^ TODO: man adjtimex about tmx.offset:
// "Since Linux 2.6.26, the supplied value is clamped to the range (-0.5s, +0.5s)"
// - can use this larger value instead?
#define SLEW_THRESHOLD 0.5
// ^^^^ used to be 0.125.
// Since Linux 2.6.26 (circa 2006), kernel accepts (-0.5s, +0.5s) range

/* Stepout threshold (sec). std ntpd uses 900 (11 mins (!)) */
//UNUSED: #define WATCH_THRESHOLD 128

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