From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu, 22 May 2014 13:49:11 +0000 (+0200)
Subject: sys: set tick_update_hz to 100 by default in Linux driver
X-Git-Tag: 1.30-pre1~35
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=14687d003d926e2afebba1d03336201a51045b0f;p=thirdparty%2Fchrony.git

sys: set tick_update_hz to 100 by default in Linux driver

We can't reliably detect the internal kernel HZ, it may not even be
fixed (CONFIG_NO_HZ). Use a fixed value of 100.
---

diff --git a/sys_linux.c b/sys_linux.c
index 930f55f1..b1041ff8 100644
--- a/sys_linux.c
+++ b/sys_linux.c
@@ -298,7 +298,10 @@ get_version_specific_details(void)
   basic_freq_scale = dshift_hz / dhz;
   nominal_tick = (1000000L + (hz/2))/hz; /* Mirror declaration in kernel */
   max_tick_bias = nominal_tick / 10;
-  tick_update_hz = hz;
+
+  /* We can't reliably detect the internal kernel HZ, it may not even be fixed
+     (CONFIG_NO_HZ aka tickless), assume the lowest commonly used fixed rate */
+  tick_update_hz = 100;
 
   /* The basic_freq_scale comes from:
      * the kernel increments the usec counter HZ times per second (if the timer