From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Wed, 4 Jun 2014 08:48:03 +0000 (+0200)
Subject: local: round log value of clock precision
X-Git-Tag: 1.30-pre1~15
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=97ba9e4d4707cc14cd186ec73e50cac9687109c6;p=thirdparty%2Fchrony.git

local: round log value of clock precision

This is similar to what the reference NTP implementation does. With 1us
clock resolution that gives -20 instead of -19.
---

diff --git a/local.c b/local.c
index 513779eb..158aa0cb 100644
--- a/local.c
+++ b/local.c
@@ -126,11 +126,15 @@ calculate_sys_precision(void)
   assert(best_dusec > 0);
 
   precision_quantum = best_dusec * 1.0e-6;
+
+  /* Get rounded log2 value of the measured precision */
   precision_log = 0;
-  while (best_dusec < 500000) {
+  while (best_dusec < 707107) {
     precision_log--;
     best_dusec *= 2;
   }
+
+  DEBUG_LOG(LOGF_Local, "Clock precision %.9f (%d)", precision_quantum, precision_log);
 }
 
 /* ================================================== */