From 8502fa8747e962f69084be09ff8b930e0fb0c449 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Fri, 15 Feb 2019 14:32:08 +0100 Subject: [PATCH] ntpd: increase SLEW_THRESHOLD from 0.125 to 0.5 Linux kernel supports it since ~2006 Signed-off-by: Denys Vlasenko --- networking/ntpd.c | 9 ++++----- 1 file 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