ci/lava: Disable CPU frequency scaling

Lock CPU frequency scaling to max to speed up test execution and lower
the variation of frame times from performance replay jobs.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Corentin Noël <corentin.noel@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11101>

.gitlab-ci/lava.yml.jinja2

@@ -82,9 +82,14 @@ actions:
 
           - modprobe amdgpu || true
 
+          # Disable GPU frequency scaling
           - DEVFREQ_GOVERNOR=`find /sys/devices -name governor | grep gpu || true`
           - echo performance > $DEVFREQ_GOVERNOR || true
 
+          # Disable CPU frequency scaling
+          - echo performance | tee -a /sys/devices/system/cpu/cpufreq/policy*/scaling_governor || true
+
+          # Disable GPU runtime PM
           - GPU_AUTOSUSPEND=`find /sys/devices -name autosuspend_delay_ms | grep gpu | head -1`
           - echo -1 > $GPU_AUTOSUSPEND || true