experiments/power: Disable thermal throttling

Disable thermal engine and perfd that can cause thermal throttling
and interfere with the power measurements.

Test: run ./run_cpu_frequency.py

Change-Id: Ifc811f29cb9ac1a3b9213ff9869ce16b664917b3

1 files changed, 8 insertions, 0 deletions

diff --git a/experiments/power/eas/run_cpu_frequency.py b/experiments/power/eas/run_cpu_frequency.py
index 011b942..15bddaa 100755
--- a/experiments/power/eas/run_cpu_frequency.py
+++ b/experiments/power/eas/run_cpu_frequency.py
@@ -94,6 +94,10 @@ def experiment():
     # Turn off screen
     Screen.set_screen(target, on=False)
 
+    # Stop thermal engine and perfd
+    target.execute("stop thermal-engine")
+    target.execute("stop perfd")
+
     # Store governors so they can be restored later
     governors = [ target.cpufreq.get_governor(cpu) for cpu in cpus]
 
@@ -163,6 +167,10 @@ def experiment():
     # Restore non critical tasks
     target.cgroups.freeze(thaw=True)
 
+    # Stop thermal engine and perfd
+    target.execute("start thermal-engine")
+    target.execute("start perfd")
+
     # Dump platform
     te.platform_dump(outdir)