Latest revision as of 20:13, 21 October 2009

Description

A simple test to determine effect of SATA link power management settings on power consumption.
Privileges: Root
Runlevel: singleuser
ETA: 10 minutes

How to test

Live Image Friendly
You may run this test case using the USB or CD live image if you install the powertop utility with yum install powertop

Hotplug issues
SATA link power states other than max_performance may cause problems with hotplugable external SATA ports and devices attached to those ports may have problems. Internal devices should be unaffected.

System must remain idle
Please do not do any other work on the system while running this test, otherwise power usage figures may be inaccurate.

Make sure laptop battery is fully charged.
Reboot laptop to single user mode. Refer to the Install guide for more information about single user mode
Unplug AC power from the laptop.

Enable the max_performance link state using the following command:

for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo max_performance > $i; done

Obtain system power usage using the following command:
```
powertop -d -t 60 | grep 'Power usage'
```
Record the ACPI power usage estimate printed in Watts(W). This will be the power consumption at the max_performance setting.

Enable the medium_power link state using the following command:

for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo medium_power > $i; done

Obtain system power usage using the following command:
```
powertop -d -t 60 | grep 'Power usage'
```
Record the ACPI power usage estimate printed in Watts(W). This will be the power consumption at the medium_power setting.

Enable the min_power link state using the following command:

for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo min_power > $i; done

Obtain system power usage using the following command:
```
powertop -d -t 60 | grep 'Power usage'
```
Record the ACPI power usage estimate printed in Watts(W). This will be the power consumption at the min_power setting.

Expected Results

Sample results

[root@laptop ~]# for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo medium_power > $i; done
[root@laptop ~]# powertop -d -t 60 | grep 'Power usage'
Power usage (ACPI estimate): 22.3W (1.9 hours)

Please add the following to the results table.

Power usage for all three link power settings, max_performance, medium_power, min_power.
Your smolt system profile. (no need to resubmit if you have already for one of the other tests)
Please open bugs if you notice any abnormal behavior such as system hangs, kernel oops messages, serious IO performance degradation.
You may return your system to its default state by running the command in step 4 again or just reboot.

@@ Line 1: / Line 1: @@
 {{QA/Test_Case
-|description=A simple test to determine effect of SATA link power management settings on power consumption.
+|description=A simple test to determine effect of SATA link power management settings on power consumption.<br/>
-'''Privileges''': Root<br />
+'''Privileges''': Root<br/>
-'''Runlevel''': singleuser (X11)<br/>
+'''Runlevel''': singleuser <br/>
 '''ETA''': 10 minutes<br/>
 |actions=
+{{admon/note|Live Image Friendly|You may run this test case using the USB or CD live image if you install the powertop utility with <code>yum install powertop</code>}}
+{{admon/caution|Hotplug issues|SATA link power states other than max_performance may cause problems with hotplugable external SATA ports and devices attached to those ports may have problems. Internal devices should be unaffected.}}
+{{admon/important|System must remain idle|Please do not do any other work on the system while running this test, otherwise power usage figures may be inaccurate.}}
 # Make sure laptop battery is fully charged.
-# Reboot laptop to single user mode.
+# Reboot laptop to single user mode.  Refer to the [http://docs.fedoraproject.org/install-guide/f{{FedoraVersion}}/en-US/html/s1-rescuemode-booting-single.html Install guide] for more information about single user mode
-# Unplug AC power from the laptop.
+# '''Unplug''' AC power from the laptop.
-# run: <code>for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo max_performance > $i; done</code>
+# Enable the '''max_performance''' link state using the following command:
-# run: <code>powertop -d -t 60 {{!}} grep 'Power usage'</code>
+#: <pre>for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo max_performance > $i; done</pre>
-# Record the power usage estimate printed in Watts. This will be the power consumption at the max_performance setting.
+# Obtain system power usage using the following command:
-# run: <code>for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo medium_power > $i; done</code>
+#: <pre>powertop -d -t 60 | grep 'Power usage'</pre>
-# run: <code>powertop -d -t 60 | grep 'Power usage'</code>
+# Record the ACPI power usage estimate printed in Watts(W). This will be the power consumption at the '''max_performance''' setting.
-# Record the power usage estimate printed in Watts. This will be the power consumption at the medium_power setting.
+# Enable the '''medium_power''' link state using the following command:
-# run: <code>for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo min_power > $i; done</code>
+#: <pre>for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo medium_power > $i; done</pre>
-# run: <code>powertop -d -t 60 | grep 'Power usage'</code>
+# Obtain system power usage using the following command:
-# Record the power usage estimate printed in Watts. This will be the power consumption at the min_power setting.
+#: <pre>powertop -d -t 60 | grep 'Power usage'</pre>
+# Record the ACPI power usage estimate printed in Watts(W). This will be the power consumption at the '''medium_power''' setting.
+# Enable the '''min_power''' link state using the following command:
+#: <pre>for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo min_power > $i; done</pre>
+# Obtain system power usage using the following command:
+#: <pre>powertop -d -t 60 | grep 'Power usage'</pre>
+# Record the ACPI power usage estimate printed in Watts(W). This will be the power consumption at the '''min_power''' setting.
 |results=
+{{admon/tip|Sample results|<pre>
+[root@laptop ~]# for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo medium_power > $i; done
+[root@laptop ~]# powertop -d -t 60 | grep 'Power usage'
+Power usage (ACPI estimate): 22.3W (1.9 hours)
+</pre>}}
 Please add the following to the results table.
-# Power consumption for all three link power settings, max_performance, medium_power, min_power.
+# Power usage for all three link power settings, max_performance, medium_power, min_power.
 # Your smolt system profile. (no need to resubmit if you have already for one of the other tests)
 # Please open bugs if you notice any abnormal behavior such as system hangs, kernel oops messages, serious IO performance degradation.
 # You may return your system to its default state by running the command in step 4 again or just reboot.
 }}
+<references/>
 [[Category:Power Management Test Cases]]

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QA:Testcase Power Management alpm: Difference between revisions

Latest revision as of 20:13, 21 October 2009

Description

How to test

Expected Results