diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_create/zpool_create_024_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_create/zpool_create_024_pos.ksh
index 9908d0754f..5b464c3c24 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_create/zpool_create_024_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_create/zpool_create_024_pos.ksh
@@ -39,6 +39,10 @@
 
 verify_runnable "global"
 
+if is_32bit; then
+	log_unsupported "Test case runs slowly on 32 bit"
+fi
+
 function cleanup
 {
 	if [[ -n "$child_pids" ]]; then
diff --git a/tests/zfs-tests/tests/functional/write_dirs/write_dirs_002_pos.ksh b/tests/zfs-tests/tests/functional/write_dirs/write_dirs_002_pos.ksh
index 9f0b3f3cdc..05fd3f4f2e 100755
--- a/tests/zfs-tests/tests/functional/write_dirs/write_dirs_002_pos.ksh
+++ b/tests/zfs-tests/tests/functional/write_dirs/write_dirs_002_pos.ksh
@@ -46,6 +46,10 @@
 
 verify_runnable "both"
 
+if is_32bit; then
+	log_unsupported "Test case runs slowly on 32 bit"
+fi
+
 function cleanup
 {
 	for file in `find $TESTDIR -type f`; do
diff --git a/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_002_pos.ksh b/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_002_pos.ksh
index 00a7ac1663..c58f71f496 100755
--- a/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_002_pos.ksh
+++ b/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_002_pos.ksh
@@ -44,6 +44,10 @@
 
 verify_runnable "global"
 
+if is_32bit; then
+	log_unsupported "Test case runs slowly on 32 bit"
+fi
+
 volsize=$(zfs get -H -o value volsize $TESTPOOL/$TESTVOL)
 
 function cleanup
@@ -88,7 +92,7 @@ done
 
 if is_linux; then
 	EXIT_STATUS=4
-	sync
+	log_must sync
 else
 	EXIT_STATUS=39
 	log_must lockfs -f $TESTDIR