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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-02-15 14:32:08 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-02-15 14:32:08 +0100
commit8502fa8747e962f69084be09ff8b930e0fb0c449 (patch)
tree7157e3cad73c2f562c6797e816af429733495a8c
parentd712edc6d8f904a4e9d2e26fc9e8a4c45a2cf0b0 (diff)
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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>
-rw-r--r--networking/ntpd.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/networking/ntpd.c b/networking/ntpd.c
index 855815ece..0f474bc09 100644
--- a/networking/ntpd.c
+++ b/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