Difference between revisions of "Aggressive Link Power Management (ALPM)"
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− | == | + | __TOC__ |
− | + | == Overview == | |
− | + | Aggressive Link Power Management (ALPM) is a mechanism for reducing SSD/HDD power consumption. | |
− | + | If ALPM is enabled, SSD goes into low-power mode when SSD has no I/O activity. On I/O request, SSD power is resumed. | |
− | + | == Enabling ALPM in Windows == | |
− | + | * HIPM = Host Initiated Link Power Management | |
− | + | * DIPM = Device Initiated Link Power Management | |
The Link Power Management option is hidden/disabled by default in Windows advanced power options, and it is required to add the support into Windows registry: | The Link Power Management option is hidden/disabled by default in Windows advanced power options, and it is required to add the support into Windows registry: | ||
− | # Adding the | + | # Adding the ALPM – HIPM/DIPM option to Advanced Power Settings. |
− | ## Download the [http://fit-pc.com/download/app-notes/ahci-link-power-management/Add_LPM.reg Add_LPM.reg] | + | ## Download the [http://fit-pc.com/download/app-notes/ahci-link-power-management/Add_LPM.reg Add_LPM.reg] (Right click and Save link as...). |
## Right click on the downloaded '''Add_LPM.reg''' file and click on Merge. | ## Right click on the downloaded '''Add_LPM.reg''' file and click on Merge. | ||
## After the success message appears, restart the unit. | ## After the success message appears, restart the unit. | ||
− | # Removing the | + | # Removing the ALPM – HIPM/DIPM option from Advanced Power Settings. |
− | ## Download the [http://fit-pc.com/download/app-notes/ahci-link-power-management/Remove_LPM.reg Remove_LPM.reg] | + | ## Download the [http://fit-pc.com/download/app-notes/ahci-link-power-management/Remove_LPM.reg Remove_LPM.reg] (Right click and Save link as...). |
## Right click on the downloaded '''Remove_LPM.reg''' file and click on Merge. | ## Right click on the downloaded '''Remove_LPM.reg''' file and click on Merge. | ||
## After the success message appears, restart the unit. | ## After the success message appears, restart the unit. | ||
− | # Configuring the | + | # Configuring the ALPM – HIPM/DIPM option in the Advanced Power Settings. |
## Click on the Start button. | ## Click on the Start button. | ||
## Type Power Options in the Start search box and press Enter. | ## Type Power Options in the Start search box and press Enter. | ||
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## In the Plan Settings window, click on the Change advanced power settings. | ## In the Plan Settings window, click on the Change advanced power settings. | ||
## In the Advanced Plan Settings click on the Hard disk option and expand it. | ## In the Advanced Plan Settings click on the Hard disk option and expand it. | ||
− | ## The following settings are responsible on the | + | ## The following settings are responsible on the ALPM: |
− | :::::* | + | :::::* ALPM – HIPM/DIPM. It will set the Link Power Management policy: |
:::::** Active: Neither HIPM or DIPM allowed | :::::** Active: Neither HIPM or DIPM allowed | ||
:::::** HIPM: HIPM only is allowed | :::::** HIPM: HIPM only is allowed | ||
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:::::** DIPM: DIPM only is allowed | :::::** DIPM: DIPM only is allowed | ||
:::::** Lowest:HIPM, DIPM and DEVSLP are allowed (if DEVSLP is supported by the storage device). | :::::** Lowest:HIPM, DIPM and DEVSLP are allowed (if DEVSLP is supported by the storage device). | ||
− | :::::* | + | :::::* ALPM – Adaptive. It will set the period of AHCI link idle time before the link is put in the slumber state when you have HIPM, DIPM, HIPM+DIPM or Lowest set above. It can be set to be from 0 to 300,000 milliseconds. If the Active is set above, then this will have no effect. |
− | + | ||
− | + | ||
− | + | ||
+ | == Enabling ALPM in Linux == | ||
* Create text file /etc/pm/power.d/sata_alpm | * Create text file /etc/pm/power.d/sata_alpm | ||
#!/bin/sh | #!/bin/sh | ||
− | |||
for i in /sys/class/scsi_host/host*/link_power_management_policy; do | for i in /sys/class/scsi_host/host*/link_power_management_policy; do | ||
echo min_power > $i | echo min_power > $i | ||
Line 47: | Line 44: | ||
min_power | min_power | ||
min_power | min_power | ||
+ | * To disable ALPM simply delete file /etc/pm/power.d/sata_alpm | ||
+ | sudo rm /etc/pm/power.d/sata_alpm | ||
+ | <br> | ||
+ | [[category:application notes]] | ||
[[category:products]] | [[category:products]] | ||
[[category:IPC2]] | [[category:IPC2]] |
Latest revision as of 12:59, 17 December 2015
Overview
Aggressive Link Power Management (ALPM) is a mechanism for reducing SSD/HDD power consumption. If ALPM is enabled, SSD goes into low-power mode when SSD has no I/O activity. On I/O request, SSD power is resumed.
Enabling ALPM in Windows
* HIPM = Host Initiated Link Power Management * DIPM = Device Initiated Link Power Management
The Link Power Management option is hidden/disabled by default in Windows advanced power options, and it is required to add the support into Windows registry:
- Adding the ALPM – HIPM/DIPM option to Advanced Power Settings.
- Download the Add_LPM.reg (Right click and Save link as...).
- Right click on the downloaded Add_LPM.reg file and click on Merge.
- After the success message appears, restart the unit.
- Removing the ALPM – HIPM/DIPM option from Advanced Power Settings.
- Download the Remove_LPM.reg (Right click and Save link as...).
- Right click on the downloaded Remove_LPM.reg file and click on Merge.
- After the success message appears, restart the unit.
- Configuring the ALPM – HIPM/DIPM option in the Advanced Power Settings.
- Click on the Start button.
- Type Power Options in the Start search box and press Enter.
- In the Power options window, click on the Change plan settings of the current power plan.
- In the Plan Settings window, click on the Change advanced power settings.
- In the Advanced Plan Settings click on the Hard disk option and expand it.
- The following settings are responsible on the ALPM:
- ALPM – HIPM/DIPM. It will set the Link Power Management policy:
- Active: Neither HIPM or DIPM allowed
- HIPM: HIPM only is allowed
- HIPM+DIPM:HIPM and DIPM are allowed
- DIPM: DIPM only is allowed
- Lowest:HIPM, DIPM and DEVSLP are allowed (if DEVSLP is supported by the storage device).
- ALPM – Adaptive. It will set the period of AHCI link idle time before the link is put in the slumber state when you have HIPM, DIPM, HIPM+DIPM or Lowest set above. It can be set to be from 0 to 300,000 milliseconds. If the Active is set above, then this will have no effect.
- ALPM – HIPM/DIPM. It will set the Link Power Management policy:
Enabling ALPM in Linux
- Create text file /etc/pm/power.d/sata_alpm
#!/bin/sh for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo min_power > $i done
- Make it executable
$ sudo chmod +x /etc/pm/power.d/sata_alpm
- Reboot, check that SATA power management policy have been changed
$ cat /sys/class/scsi_host/host*/link_power_management_policy min_power min_power
- To disable ALPM simply delete file /etc/pm/power.d/sata_alpm
sudo rm /etc/pm/power.d/sata_alpm