Add support for experiments with kernel polling

experiments/memcached.shared.sh

@@ -10,7 +10,7 @@ cleanup_mutilate() {
 
 cleanup_memcached() {
     echo "Killing memcached process"
-    kill $MEMCACHED_PID
+    kill -INT $MEMCACHED_PID
 }
 
 start_memcached() {

experiments/memcached_qps_scan.sh

@@ -23,7 +23,12 @@ pre_start() {
 }
 
 run_exp() {
-    start_memcached
+    MEMCACHED_ARGS=""
+    if [ "$NAPI_LOCALITY" == "true" ]; then
+        MEMCACHED_ARGS="-N $THREADS"
+    fi
+
+    start_memcached $MEMCACHED_ARGS
     start_mutilate
     warmup
 

run.sh

@@ -26,6 +26,11 @@ while [[ $# -gt 0 ]]; do
             shift
             shift
             ;;
+        --extra-tuning)
+            EXTRA_TUNING="$2"
+            shift
+            shift
+            ;;
         *)
             break
             ;;
@@ -47,6 +52,9 @@ source "./experiments/$EXPERIMENT.sh"
 pre_start
 
 EXPERIMENT_NAME="$EXPERIMENT.$(uname -r)"
+if [ ! -z "$EXTRA_TUNING" ]; then
+    EXPERIMENT_NAME="$EXPERIMENT_NAME.$EXTRA_TUNING"
+fi
 if [ ! -z "$EXPERIMENT_NAME_EXT" ]; then
     EXPERIMENT_NAME="$EXPERIMENT_NAME.$EXPERIMENT_NAME_EXT"
 fi
@@ -57,6 +65,7 @@ rm -rf "$DATA_OUT"
 mkdir -p "$DATA_OUT"
 
 source ./tunings/normalize_queues.sh
+[ ! -z "$EXTRA_TUNING" ] && source ./tunings/"$EXTRA_TUNING".sh
 
 run_exp
 

tunings/kernel_polling.sh

+if [ ! "$(uname -r)" == "5.15.79-peter" ]; then
+    echo "kernel polling only supported on patched kernel"
+    exit 1
+fi
+
+sysctl net.core.busy_poll=128
+# NAPI locality is needed for multi-threaded experiments
+NAPI_LOCALITY=true