add UE parameter to enable TTI stats calculations

srsue/hdr/stack/ue_stack_base.h

@@ -66,6 +66,7 @@ typedef struct {
   std::string      ue_category_str;
   nas_args_t       nas;
   gw_args_t        gw;
+  bool             have_tti_time_stats;
 } stack_args_t;
 
 class ue_stack_base

srsue/src/main.cc

@@ -366,7 +366,11 @@ static int parse_args(all_args_t* args, int argc, char* argv[])
 
     ("general.metrics_csv_filename",
        bpo::value<string>(&args->general.metrics_csv_filename)->default_value("/tmp/ue_metrics.csv"),
-       "Metrics CSV filename");
+       "Metrics CSV filename")
+
+    ("stack.have_tti_time_stats",
+        bpo::value<bool>(&args->stack.have_tti_time_stats)->default_value(true),
+        "Calculate TTI execution statistics");
 
   // Positional options - config file location
   bpo::options_description position("Positional options");

srsue/src/stack/ue_stack_lte.cc

@@ -295,8 +295,15 @@ void ue_stack_lte::run_tti_impl(uint32_t tti)
   nas.run_tti(tti);
   timers.step_all();
 
-  auto end = std::chrono::steady_clock::now();
-  calc_tti_stats(std::chrono::duration_cast<std::chrono::microseconds>(end - start).count());
+  if (args.have_tti_time_stats) {
+    auto end = std::chrono::steady_clock::now();
+    calc_tti_stats(std::chrono::duration_cast<std::chrono::microseconds>(end - start).count());
+  }
+
+  // print warning if PHY pushes new TTI messages faster than we process them
+  if (pending_tasks.size(sync_queue_id) > SYNC_QUEUE_WARN_THRESHOLD) {
+    log.warning("Detected slow task processing (sync_queue_len=%zd).\n", pending_tasks.size(sync_queue_id));
+  }
 }
 
 void ue_stack_lte::calc_tti_stats(const uint32_t duration_us)
@@ -319,11 +326,6 @@ void ue_stack_lte::calc_tti_stats(const uint32_t duration_us)
 
     proc_time.clear();
   }
-
-  // print warning if PHY pushes new TTI messages faster than we process them
-  if (pending_tasks.size(sync_queue_id) > SYNC_QUEUE_WARN_THRESHOLD) {
-    log.warning("Detected slow task processing (sync_queue_len=%zd).\n", pending_tasks.size(sync_queue_id));
-  }
 }
 
 /********************

srsue/ue.conf.example

@@ -348,8 +348,11 @@ enable = false
 #
 # metrics_csv_filename: File path to use for CSV metrics.
 #
+# have_tti_time_stats:  Calculate TTI execution statistics using system clock
+#
 #####################################################################
 [general]
 #metrics_csv_enable  = false
 #metrics_period_secs = 1
 #metrics_csv_filename = /tmp/ue_metrics.csv
+#have_tti_time_stats = true