Smartreflex - Revision history

qwazix: /* Enabling Smartreflex */

qwazix — Thu, 02 Aug 2012 09:43:43 GMT

Enabling Smartreflex

← Older revision		Revision as of 09:43, 2 August 2012
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	echo 1 > /sys/power/sr_vdd1_autocomp		echo 1 > /sys/power/sr_vdd1_autocomp
	echo 1 > /sys/power/sr_vdd2_autocomp		echo 1 > /sys/power/sr_vdd2_autocomp
-

	This setting is not persistent and will reset to default after a reboot. It is recommended you test with this method first to determine if SR will work for your setup.		This setting is not persistent and will reset to default after a reboot. It is recommended you test with this method first to determine if SR will work for your setup.
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	===Terminal===		===Terminal===

-	~~===Alternative Terminal Method===~~	+	To eneble smartreflex persistently edit /etc/pmconfig
-		+
-	~~This alternative method can be used even if Stock Kernel is used.~~	+

	sudo leafpad /etc/pmconfig		sudo leafpad /etc/pmconfig

-	Use leafpad text editor to change, ~~sr_vdd_autocomp~~ to:-	+	Use leafpad text editor to change, sr_vddX_autocomp values to: 1

	sr_vdd1_autocomp 1		sr_vdd1_autocomp 1
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	[[http://maemo.org/downloads/product/Maemo5/qcpufreq/ QCPUFreq]] application has an option to enable Smartreflex via GUI.		[[http://maemo.org/downloads/product/Maemo5/qcpufreq/ QCPUFreq]] application has an option to enable Smartreflex via GUI.
-	However it currently only ~~changes~~ both VDD1 and VDD2 values together.	+	However it currently only enables VDD1 and disables both VDD1 and VDD2 values together if previously enabled. This [[http://talk.maemo.org/showpost.php?p=1157835&postcount=180 script]] from talk.maemo.org has been tested by at least two users and modifies QCPUFreq to enable and disable both values together.
		+
		+	If you know a GUI method that works out of the box please edit.

qwazix: /* Temporarily from terminal */

qwazix — Thu, 02 Aug 2012 09:38:07 GMT

Temporarily from terminal

← Older revision		Revision as of 09:38, 2 August 2012
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-	This ~~will~~ not ~~take effect AFTER~~ a reboot. It is recommended you test with this method first to determine if SR will work for your setup.	+	This setting is not persistent and will reset to default after a reboot. It is recommended you test with this method first to determine if SR will work for your setup.

	===Terminal===		===Terminal===

qwazix: /* Terminal */

qwazix — Thu, 02 Aug 2012 09:37:15 GMT

Terminal

← Older revision		Revision as of 09:37, 2 August 2012
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	===Terminal===		===Terminal===
-
-	~~Assuming you are using [[Kernel Power]] the instruction for use are:-~~
-
-	~~[[http://wiki.maemo.org/Kernel_Power#Use_of_kernel-config Use of Kernel Power Configuration]]~~
-

	===Alternative Terminal Method===		===Alternative Terminal Method===

qwazix: /* Kernel Power */

qwazix — Thu, 02 Aug 2012 09:27:04 GMT

Kernel Power

← Older revision		Revision as of 09:27, 2 August 2012
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	==Kernel Power==		==Kernel Power==

-	Since [[Kernel Power]] 50 (KP50), despite some disagreements amongst some of the more senior Maemo developers, SmartReflex can now be considered stable up 900MHz.	+	Since [[Kernel Power]] 50 (KP50), despite some disagreements amongst some of the more senior Maemo developers, SmartReflex can now be considered stable up 900MHz with stock DSP frequencies and up to 600Mhz for overclocked DSP.

	*''I know I just said SR is stable up to 900MHz however some users have reported that on their devices SR is only stable up to lower frequencies (720-805MHz for example). For more examples on tuning SR see the KP50 article.		*''I know I just said SR is stable up to 900MHz however some users have reported that on their devices SR is only stable up to lower frequencies (720-805MHz for example). For more examples on tuning SR see the KP50 article.
	''		''
		+
	==Enabling Smartreflex==		==Enabling Smartreflex==

qwazix: /* SR on the Stock Nokia kernel */

qwazix — Thu, 02 Aug 2012 09:20:05 GMT

SR on the Stock Nokia kernel

← Older revision		Revision as of 09:20, 2 August 2012
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	==SR on the Stock Nokia kernel==		==SR on the Stock Nokia kernel==

-	Smartreflex has been considered broken for a long time. ~~Using the stock Nokia kernel it can only be activated up to 805MHz at most.~~ The Stock Nokia kernel implementation of SmartReflex is to be considered broken and its use is to be avoided.	+	Smartreflex has been considered broken for a long time. The Stock Nokia kernel implementation of SmartReflex is to be considered broken and its use is to be avoided as it has been reported to be unstable on some devices


	Due to it's instability and multiple bug reports:-		Due to it's instability and multiple bug reports:-

-	''"Nokia decided that SR will be kept disabled. In the next public update (PR 1.3) it will be made possible for advanced users to enable it if wanted."''	+	''"Nokia decided that SR will be kept disabled. In the next public update (PR 1.3) it will be made possible for advanced users to enable it if wanted."''

	==Kernel Power==		==Kernel Power==

188.195.180.253: /* The official explanation */

188.195.180.253 — Wed, 01 Aug 2012 20:17:26 GMT

The official explanation

← Older revision		Revision as of 20:17, 1 August 2012
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	::''"SmartReflex is an advanced, multi-level and multi-parameter power management approach that can be found at some TI DSPs of the OMAP35x series."''[http://www.ti.com/general/docs/wtbu/wtbugencontent.tsp?templateId=6123&navigationId=12032&contentId=4609]		::''"SmartReflex is an advanced, multi-level and multi-parameter power management approach that can be found at some TI DSPs of the OMAP35x series."''[http://www.ti.com/general/docs/wtbu/wtbugencontent.tsp?templateId=6123&navigationId=12032&contentId=4609]

-	~~'''TL;DR.'''~~ SmartReflex is a nifty way of scaling the voltage of the processor in a way similar to frequency scaling. That is, voltage is increased as it is required. Conversely it is decreased as it is not required. Most users report that this has lead to an increase of around 1/3 battery life. (DISCLAIMER:1/3 battery life is dependent on a particular users set up and style of use.)	+	SmartReflex is a nifty way of scaling the voltage of the processor in a way similar to frequency scaling. That is, voltage is increased as it is required. Conversely it is decreased as it is not required. Most users report that this has lead to an increase of around 1/3 battery life. (DISCLAIMER:1/3 battery life is dependent on a particular users set up and style of use.)

-	This module adjusts OMAP3 VDD1 and VDD2 operating voltages around the nominal values of current operating point depending on silicon characteristics and operating conditions.	+	This module adjusts OMAP3 VDD1 and VDD2 operating voltages around the nominal values of current operating point depending on silicon characteristics and operating conditions.

	==SR on the Stock Nokia kernel==		==SR on the Stock Nokia kernel==

92.234.106.149: /* GUI */

92.234.106.149 — Sat, 02 Jun 2012 12:23:35 GMT

GUI

← Older revision		Revision as of 12:23, 2 June 2012
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	[[http://maemo.org/downloads/product/Maemo5/qcpufreq/ QCPUFreq]] application has an option to enable Smartreflex via GUI.		[[http://maemo.org/downloads/product/Maemo5/qcpufreq/ QCPUFreq]] application has an option to enable Smartreflex via GUI.
-	However it currently only changes VDD1 values.	+	However it currently only changes both VDD1 and VDD2 values together.

vee: /* Alternative Terminal Method */

vee — Fri, 01 Jun 2012 10:36:14 GMT

Alternative Terminal Method

← Older revision		Revision as of 10:36, 1 June 2012
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	sr_vdd2_autocomp 1		sr_vdd2_autocomp 1

-	*Warning! If you set overclock voltages above that which smartreflex is stable AND you enable SR from /etc/pmconfig you WILL get a re-boot loop. You will need to re-flash to fix.	+	''Warning! If you set overclock voltages above that which smartreflex is stable AND you enable SR from /etc/pmconfig you WILL get a re-boot loop. You will need to re-flash to fix.''

	===GUI===		===GUI===

vee: /* Temporarily from terminal */

vee — Fri, 01 Jun 2012 10:35:47 GMT

Temporarily from terminal

← Older revision		Revision as of 10:35, 1 June 2012
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	===Temporarily from terminal===		===Temporarily from terminal===

-	echo 1 > /sys/power/sr_vdd1_autocomp	+	echo 1 > /sys/power/sr_vdd1_autocomp
-	echo 1 > /sys/power/sr_vdd2_autocomp	+	echo 1 > /sys/power/sr_vdd2_autocomp

vee: /* Enabling Smartreflex */

vee — Fri, 01 Jun 2012 10:35:23 GMT

Enabling Smartreflex

← Older revision		Revision as of 10:35, 1 June 2012
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	''		''
	==Enabling Smartreflex==		==Enabling Smartreflex==
		+
		+	===Temporarily from terminal===
		+
		+	echo 1 > /sys/power/sr_vdd1_autocomp
		+	echo 1 > /sys/power/sr_vdd2_autocomp
		+
		+
		+	This will not take effect AFTER a reboot. It is recommended you test with this method first to determine if SR will work for your setup.

	===Terminal===		===Terminal===
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	sr_vdd2_autocomp 1		sr_vdd2_autocomp 1

		+	*Warning! If you set overclock voltages above that which smartreflex is stable AND you enable SR from /etc/pmconfig you WILL get a re-boot loop. You will need to re-flash to fix.

	===GUI===		===GUI===