[Dynamicpower-devel] Some DPM measures in OMAP1510

[Daniel P. <d.p...@gm...>]

Hi folks,

Here goes some measures in order to evaluate Dynamic Power Management in=20
OMAP platforms although this preliminarly version focus in frequency scalin=
g=20
and time responses.

Measures taken from a Innovator 1510 Rev D board and a standard regulated
power source

Date 30/march/2005 - INdT- Nokia Institute of Technology - Manaus - Brazil

Using Dynamic Power Management patch -
dynamicpower.sourceforge.net<http://dynamicpower.sourceforge.net>
With omap 2.6.11 kernel (www.muru.com/linux/omap<http://www.muru.com/linux/=
omap>
)

1)Static Power=20

State |Active(A) |Suspend(A) |Display Off(A)
---------------------------------------------------------------------------=
----
System Idle |0,82 |0,49 |0,59
System running |1,05 |0,49 |0,85

o 1.6 V @ 168 MHz - no voltage scaling
o Device power management used to turn off display


2)Dynamic Power (mainly voltage scaling using DPM)

Policy |Task Mhz |Idle Mhz |Time(s) |Consumption(A) |Sys Idle (A)
---------------------------------------------------------------------------=
-----------------
Hi |168 |168 |18,62 |1,05 |0,82
HL |168 |48 |18,61 |1,05 |0,75
L4 |60 |60 |52,23 |0,85 |0,76
L3 |48 |48 |65,39 |0,82 |0,75
L2 |36 |36 |87,63 |0,79 |0,73
L1 |12 |12 |267,57 |0,73 |0,71


o Steady state current (idle): 0,82A @ 168MHz
o Always at 1.6V (1510 does not voltage scale)
o Application tested: 99 % user, 1 % system - does not have idle
during its execution
o Not best example for DPM usage only frequency scaling and
electrical current (power) variation=20
o More and different apps necessary for good DPM test - near real system


Comments and other results are welcome.

Best Regards,

Daniel Petrini
------------------------------------------------
10LE - Linux
Nokia Institute of Tecnology - INdT
Manaus - Brazil