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ntpd: increase SLEW_THRESHOLD from 0.125 to 0.5

Linux kernel supports it since ~2006

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Denys Vlasenko 5 years ago
parent
commit
8502fa8747
1 changed files with 4 additions and 5 deletions
  1. 4 5
      networking/ntpd.c

+ 4 - 5
networking/ntpd.c

@@ -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