docs(benchpress): add details about normalized mobile environment.

tbosch · tbosch · commit c25478380c7c · 2015-04-15T10:12:13.000-07:00
diff --git a/modules/benchpress/docs/index.md b/modules/benchpress/docs/index.md
@@ -162,7 +162,10 @@ When looking into the DevTools Timeline, we see a marker as well:
 
 * Use normalized environments
   - metrics that are dependent on the performance of the execution environment must be executed on a normalized machine
-  - e.g. a real mobile device whose cpu frequency is set to a fixed value
+  - e.g. a real mobile device whose cpu frequency is set to a fixed value.
+      * see our [build script](https://github.com/angular/angular/blob/master/scripts/ci/android_cpu.sh)
+      * this requires root access, e.g. via a userdebug build of Android on a Google Nexus device
+        (see [here](https://source.android.com/source/building-running.html) and [here](https://source.android.com/source/building-devices.html#obtaining-proprietary-binaries))
   - e.g. a calibrated machine that does not run background jobs, has a fixed cpu frequency, ...
 
 * Use relative comparisons
