From: Francis Dupont <fdupont@isc.org>
Date: Mon, 13 Jul 2020 13:44:04 +0000 (+0200)
Subject: [#1311] Addressed comments
X-Git-Tag: Kea-1.7.10~58
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d25876b77419ee08816d9fab823324f685772208;p=thirdparty%2Fkea.git

[#1311] Addressed comments
---

diff --git a/ChangeLog b/ChangeLog
index 81b616f9ae..f2c47a959b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
-1770.	[perf]		fdupont
+1772.	[perf]		fdupont
 	Set kea-lfc process priority to lower than default.
+	This change should alleviate CPU utilization spikes caused
+	by LFC process observed on some systems.
 	(Gitlab #1311)
 
 1771.	[func]		fdupont
diff --git a/src/bin/lfc/main.cc b/src/bin/lfc/main.cc
index 2e67e9b3b7..a04dfe79e8 100644
--- a/src/bin/lfc/main.cc
+++ b/src/bin/lfc/main.cc
@@ -25,6 +25,10 @@ using namespace isc::lfc;
 /// errors, EXIT_FAILURE otherwise.
 int main(int argc, char* argv[]) {
     // Ask scheduling to not give too much resources to LFC.
+    // First parameter means to change only the process priority.
+    // Second parameter (0) means the calling process.
+    // Third parameter 4 is a bit below the default priority of 0 in
+    // a range of -20 (highest priority) and 19 or 20 (lowest priority).
     static_cast<void>(setpriority(PRIO_PROCESS, 0, 4));
 
     int ret = EXIT_SUCCESS;