diff --git a/test/blobfs/rocksdb/rocksdb.sh b/test/blobfs/rocksdb/rocksdb.sh
index 0acdc9f21..3e7f7c467 100755
--- a/test/blobfs/rocksdb/rocksdb.sh
+++ b/test/blobfs/rocksdb/rocksdb.sh
@@ -13,7 +13,7 @@ run_step() {
 	echo "--spdk_cache_size=$CACHE_SIZE" >> "$1"_flags.txt
 
 	echo -n Start $1 test phase...
-	/usr/bin/time taskset 0xFFF $DB_BENCH --flagfile="$1"_flags.txt &> "$1"_db_bench.txt
+	/usr/bin/time taskset 0xFF $DB_BENCH --flagfile="$1"_flags.txt &> "$1"_db_bench.txt
 	echo done.
 }
 
diff --git a/test/blobfs/rocksdb/run_tests.sh b/test/blobfs/rocksdb/run_tests.sh
index a110e934f..d65d3b101 100755
--- a/test/blobfs/rocksdb/run_tests.sh
+++ b/test/blobfs/rocksdb/run_tests.sh
@@ -140,9 +140,9 @@ run_step() {
 	echo -n Start $1 test phase...
 	if [ "$USE_PERF" = "1" ]
 	then
-		sudo /usr/bin/time taskset 0xFFF perf record $DB_BENCH --flagfile="$1"_flags.txt &> "$1"_db_bench.txt
+		sudo /usr/bin/time taskset 0xFF perf record $DB_BENCH --flagfile="$1"_flags.txt &> "$1"_db_bench.txt
 	else
-		sudo /usr/bin/time taskset 0xFFF $DB_BENCH --flagfile="$1"_flags.txt &> "$1"_db_bench.txt
+		sudo /usr/bin/time taskset 0xFF $DB_BENCH --flagfile="$1"_flags.txt &> "$1"_db_bench.txt
 	fi
 	echo done.
 
diff --git a/test/iscsi_tgt/common.sh b/test/iscsi_tgt/common.sh
index 37c42e3ee..67e5ca1a4 100644
--- a/test/iscsi_tgt/common.sh
+++ b/test/iscsi_tgt/common.sh
@@ -13,5 +13,5 @@ if [ -z "$ISCSI_APP" ]; then
 fi
 
 if [ -z "$ISCSI_TEST_CORE_MASK" ]; then
-	ISCSI_TEST_CORE_MASK=0xFFFF
+	ISCSI_TEST_CORE_MASK=0xFF
 fi
diff --git a/test/nvmf/common.sh b/test/nvmf/common.sh
index ff087fc61..40a15c460 100755
--- a/test/nvmf/common.sh
+++ b/test/nvmf/common.sh
@@ -9,7 +9,7 @@ if [ -z "$NVMF_APP" ]; then
 fi
 
 if [ -z "$NVMF_TEST_CORE_MASK" ]; then
-	NVMF_TEST_CORE_MASK=0xFFFF
+	NVMF_TEST_CORE_MASK=0xFF
 fi
 
 function load_ib_rdma_modules()