diff --git a/playbooks/configure_swap.yaml b/playbooks/configure_swap.yaml
new file mode 100644
index 00000000000..aff454961de
--- /dev/null
+++ b/playbooks/configure_swap.yaml
@@ -0,0 +1,3 @@
+- hosts: all
+  roles:
+    - configure-swap
diff --git a/tox.ini b/tox.ini
index 7d55f5c4e03..1a295658a38 100644
--- a/tox.ini
+++ b/tox.ini
@@ -157,7 +157,7 @@ setenv =
   {[testenv]setenv}
   PYTHON=coverage run --source neutron --parallel-mode
 commands =
-  stestr run --no-subunit-trace --concurrency 4 {posargs}
+  stestr run --no-subunit-trace {posargs}
   coverage combine
   coverage report --fail-under=82 --skip-covered
   coverage html -d cover
diff --git a/zuul.d/job-templates.yaml b/zuul.d/job-templates.yaml
index b42f4c0c5de..9d81bc44199 100644
--- a/zuul.d/job-templates.yaml
+++ b/zuul.d/job-templates.yaml
@@ -32,6 +32,9 @@
             irrelevant-files:  *irrelevant-files
         - openstack-tox-cover:  # from openstack-cover-jobs template
             timeout: 4800
+            pre-run: playbooks/configure_swap.yaml
+            vars:
+              configure_swap_size: 4096
             irrelevant-files:  *irrelevant-files
         - openstack-tox-py311-with-sqlalchemy-master:
             timeout: 3600