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ntpd: increase SLEW_THRESHOLD from 0.125 to 0.5

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Linux kernel supports it since ~2006

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2019-02-15 14:32:08 +01:00
parent d712edc6d8
commit 8502fa8747
1 changed files with 4 additions and 5 deletions
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9
networking/ntpd.c
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@ -177,12 +177,11 @@
*/
#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 0.125
//^^^^^^^^^^^^^^^^^^^^^^^^^^ 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