From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Fri, 17 Aug 2018 08:46:19 +0000 (+0200)
Subject: sources: combine frequencies by variance instead of skew
X-Git-Tag: 3.4-pre1~47
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=706d0c281a5f6dff284d40e21ec170fd2f5899c5;p=thirdparty%2Fchrony.git

sources: combine frequencies by variance instead of skew

This seems to slightly improve the stability.
---

diff --git a/sources.c b/sources.c
index 658938f6..008af85e 100644
--- a/sources.c
+++ b/sources.c
@@ -549,7 +549,7 @@ combine_sources(int n_sel_sources, struct timespec *ref_time, double *offset,
     elapsed = UTI_DiffTimespecsToDouble(ref_time, &src_ref_time);
     src_offset += elapsed * src_frequency;
     offset_weight = 1.0 / sources[index]->sel_info.root_distance;
-    frequency_weight = 1.0 / src_skew;
+    frequency_weight = 1.0 / (src_frequency_sd * src_frequency_sd);
 
     DEBUG_LOG("combining index=%d oweight=%e offset=%e osd=%e fweight=%e freq=%e fsd=%e skew=%e",
               index, offset_weight, src_offset, src_offset_sd,