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--- en:xu4_ram_overclock [2017/05/17 14:09]
joy.cho [AnTuTu Benchmark Score]
+++ en:xu4_ram_overclock [2017/05/23 18:24] (current)
joy.cho [Ubuntu Guide]
@@ Line 2: / Line 2: @@
 A new higher DDR frequency is now available on XU4 series.\\
-So far, only **Android** supports the frequency set.\\
+Both of Android and Ubuntu supports the frequency set,\\
-Also you can adjust DDR frequency and governor using a new **ODROID Utility**.
+and only Android provides DRAM governor interface.\\
 <WRAP center round important>
-  * Android : Available with 4.4.4 v4.9 (17 May, 2017) or higher version
+  * Android : Available with Android 4.4.4 v4.9 (17 May, 2017) or higher version
+  * Ubuntu : Available with Ubuntu (22 May, 2017) or higher version
 </WRAP>
-==== Available list of devfreq governor and frequency ====
+===== Android Guide =====
+On Android, you can adjust DDR frequency and governor using a new **ODROID Utility**.
-== Governor ==
+=== Governor ===
 <code>
 # cat /sys/class/devfreq/exynos5-devfreq-mif/available_governors
@@ Line 17: / Line 19: @@
 </code>
-== Frequency ==
+=== Frequency ===
 <code>
 # cat /sys/class/devfreq/exynos5-devfreq-mif/available_frequencies
@@ Line 26: / Line 28: @@
 You can change devfreq governor and frequency using it.\\
-{{:en:screenshot_2017-05-17-05-27-49.png?nolink&500|}}
+{{:en:screenshot_2017-05-17-05-27-49.png?nolink&800|}}
-==== AnTuTu Benchmark Score ====
+===== Ubuntu Guide =====
+On kernel 4.9, you can change ddr frequency using boot.ini interface.\\
+The available frequency set is **933MHz, 825MHz, 728MHz and 633MHz**\\
+and the default one is **825MHz**.\\
+As we check the benchmark score using **mbw**, about 10% improvement can be expected.
+=== boot.ini ===
+Please find **ddr_freq** in boot.ini and change the value.
+<code>
+...
+# DRAM Frequency
+# Sets the LPDDR3 memory frequency
+# Supported values: 933 825 728 633 (MHZ)
+setenv ddr_freq 825
+...
+# set DDR frequency
+dmc ${ddr_freq}
+...
+</code>
+And then please make sure to reboot the system.
+<code>
+# sudo reboot
+</code>
+===== AnTuTu Benchmark Score =====
 Here is a AnTuTu benchmark score.\\
-We consider three cases.\\
+We checked the following two cases.\\
   * Case 1 : cpu governor - performance / devfreq governor - performance / devfreq clock - 825MHz
   * Case 2 : cpu governor - performance / devfreq governor - performance / devfreq clock - 933MHz
-{{:en:xu4_ddr_antutu.png?800}}
+{{:en:xu4_antutu_totalscore.png?700}} \\
+{{:en:xu4_antutu_details.png?700}}
 ^     ^  Total  ^  3D  ^  UX  ^   RAM  ^
 |  825MHz  |  52741    |   11081  |  12770   |   5758  |
 |  933MHz    |  53753    |   11249   |  13051  |  6207  |