From 087805d222569438e258604d2643e451631ebf03 Mon Sep 17 00:00:00 2001
From: Francisco Paisana <francisco.paisana@softwareradiosystems.com>
Date: Fri, 14 Aug 2020 10:47:24 +0100
Subject: [PATCH] add warning if scaling governor is not performance mode

---
 srsenb/src/main.cc | 23 +++++++++++++++++++++++
 srsue/src/main.cc  | 23 +++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/srsenb/src/main.cc b/srsenb/src/main.cc
index 17ffd8223..e95c63b20 100644
--- a/srsenb/src/main.cc
+++ b/srsenb/src/main.cc
@@ -424,6 +424,27 @@ static size_t fixup_log_file_maxsize(int x)
   return (x < 0) ? 0 : size_t(x) * 1024u;
 }
 
+void check_scaling_governor(const all_args_t& args)
+{
+  if (args.rf.device_name == "zmq") {
+    return;
+  }
+  std::ifstream file("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor");
+  bool          found = false;
+  if (file.is_open()) {
+    std::string line;
+    while (getline(file, line)) {
+      if (line.find("performance") != std::string::npos) {
+        found = true;
+        break;
+      }
+    }
+  }
+  if (not found) {
+    cout << "WARNING: cpu scaling governor is not set to performance mode.";
+  }
+}
+
 int main(int argc, char* argv[])
 {
   srslte_register_signal_handler();
@@ -457,6 +478,8 @@ int main(int argc, char* argv[])
   srslte::logmap::get("COMMON")->set_level(srslte::LOG_LEVEL_INFO);
   log_args(argc, argv, "ENB");
 
+  check_scaling_governor(args);
+
   // Create eNB
   unique_ptr<srsenb::enb> enb{new srsenb::enb};
   if (enb->init(args, &log_wrapper) != SRSLTE_SUCCESS) {
diff --git a/srsue/src/main.cc b/srsue/src/main.cc
index a2354a7cf..d823aa36d 100644
--- a/srsue/src/main.cc
+++ b/srsue/src/main.cc
@@ -608,6 +608,27 @@ static size_t fixup_log_file_maxsize(int x)
   return (x < 0) ? 0 : size_t(x) * 1024u;
 }
 
+void check_scaling_governor(const all_args_t& args)
+{
+  if (args.rf.device_name == "zmq") {
+    return;
+  }
+  std::ifstream file("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor");
+  bool          found = false;
+  if (file.is_open()) {
+    std::string line;
+    while (getline(file, line)) {
+      if (line.find("performance") != std::string::npos) {
+        found = true;
+        break;
+      }
+    }
+  }
+  if (not found) {
+    cout << "WARNING: cpu scaling governor is not set to performance mode.";
+  }
+}
+
 int main(int argc, char* argv[])
 {
   srslte_register_signal_handler();
@@ -637,6 +658,8 @@ int main(int argc, char* argv[])
   srslte::logmap::set_default_logger(&log_wrapper);
   log_args(argc, argv, "UE");
 
+  check_scaling_governor(args);
+
   // Create UE instance
   srsue::ue ue;
   if (ue.init(args, &log_wrapper)) {