From 1a1787b622a6e8c1eefcb2d5794191b369b5fb07 Mon Sep 17 00:00:00 2001
From: bert hubert <bert.hubert@powerdns.com>
Date: Sun, 7 Oct 2018 16:45:56 +0200
Subject: [PATCH] time sometimes goes backwards (...), do not penalize our QPS
 trackers when this happens

---
 pdns/dnsdist.hh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pdns/dnsdist.hh b/pdns/dnsdist.hh
index 8f2e7a537..2fe1f8db7 100644
--- a/pdns/dnsdist.hh
+++ b/pdns/dnsdist.hh
@@ -423,7 +423,8 @@ public:
   {
     auto delta = d_prev.udiffAndSet();
 
-    d_tokens += 1.0 * rate * (delta/1000000.0);
+    if(delta > 0.0) // time, frequently, does go backwards..
+      d_tokens += 1.0 * rate * (delta/1000000.0);
 
     if(d_tokens > burst) {
       d_tokens = burst;
-- 
2.40.0