Re: [Powertop] USB devices get wrong power use values

[Marc MERLIN <marc_powertop at merlins.org>]

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On Sun, Oct 13, 2013 at 09:22:12AM -0700, Marc MERLIN wrote:
> On Sun, Oct 13, 2013 at 08:33:51AM -0700, Arjan van de Ven wrote:
> > On 9/22/2013 4:54 PM, Marc MERLIN wrote:
> > >So, I asked on the linux-usb list, and one thing I quickly found out is that the
> > >Watt value given by powertop 2.4 is way off for USB devices:
> > 
> > what makes you think the value is off?
> > 
> > >>Power est.  Events/s    Category       Description
> > >>   8.18 W    100.0%      Device         USB device: Yubico Yubikey II (Yubico)
> > >>   8.13 W    100.0%      Device         USB device: Integrated Camera (Chicony Electronics Co., Ltd.)
> > 
> > having a USB device active also generally makes the CPU/etc use much more power,
> > which Powertop "charges" to the USB device in question.
> > 
> > 8 Watts sounds entirely reasonable for that to me...
> 
> Aah, if the CPU gets involved, then yes, it's a bit more possible.
> So, a simple USB keyboard that's unused can keep one core awake and burn 8
> watts if something else goes wrong in the kernel to cause that?

So, I just upgraded to 3.11.5, and see things like this below. Can alsa sound
really take 10W when I'm batteries?
Let me put it another way, it just cannot be correct. Full power use is 15W and
if you removed 10W for audio (I'm sure that's wrong) and 3W for wifi (that may be correct)
it means my quad core laptop is running at 2W with the screen on?
Not possible at all.

So there has to be a bug in powertop 2.4 USB device power calculation.

For what it's worth, I got the data below right after running
powertop --calibrate and letting it go through a full cycle.

----------------------------------------------------------------------------
The battery reports a discharge rate of 15.1 W
The estimated remaining time is 4 hours, 53 minutes

Summary: 572.4 wakeups/second,  18.3 GPU ops/seconds, 0.0 VFS ops/sec and 8.3% CPU use

Power est.              Usage       Events/s    Category       Description
  10.5 W    100.0%                      Device         Audio codec alsa:hwC0D0: thinkpad (Realtek)
  3.10 W      7.0 pkts/s                Device         Network interface: wlan0 (iwlwifi)
  772 mW     25.1 ms/s     208.4        Process        /usr/bin/enlightenment
 13.4 mW      1.2 ms/s       8.5        Process        xfce4-terminal -T window10 --role=window10 --tab
(...)
----------------------------------------------------------------------------

Calibrate results if that helps:
gandalfthegreat:~# powertop --calibrate
Loaded 750 prior measurements
RAPL device for cpu 0
RAPL device for cpu 0
RAPL device for cpu 0
Starting PowerTOP power estimate calibration 
Calibrating idle
Calibrating: disk usage 
Calibrating backlight
.... device /sys/class/backlight/intel_backlight/brightness 
.... device /sys/class/backlight/acpi_video0/brightness 
Calibrating idle
Calibrating: CPU usage on 1 threads
Calibrating: CPU usage on 4 threads
Calibrating: CPU wakeup power consumption
Calibrating: CPU wakeup power consumption
Calibrating: CPU wakeup power consumption
Calibrating USB devices
.... device /sys/bus/usb/devices/3-1/power/control 
.... device /sys/bus/usb/devices/4-1/power/control 
.... device /sys/bus/usb/devices/usb1/power/control 
.... device /sys/bus/usb/devices/usb2/power/control 
.... device /sys/bus/usb/devices/usb3/power/control 
.... device /sys/bus/usb/devices/usb4/power/control 
.... device /sys/bus/usb/devices/3-1.2/power/control 
.... device /sys/bus/usb/devices/3-1.6/power/control 
Calibrating radio devices
.... device /sys/class/rfkill/rfkill0/soft 
.... device /sys/class/rfkill/rfkill1/soft 
.... device /sys/class/rfkill/rfkill0/soft 
.... device /sys/class/rfkill/rfkill1/soft 
Finishing PowerTOP power estimate calibration 
Parameters after calibration:


Parameter state 
----------------------------------
Value		Name
 2.23		alsa-codec-power (2)
 0.37		backlight (3)
 3.51		backlight-boost-100 (4)
 2.52		backlight-boost-40 (5)
 6.65		backlight-boost-80 (6)
 0.00		backlight-power (7)
 0.21		base power (8)
 0.00		cpu-consumption (9)
 0.00		cpu-wakeups (10)
 0.00		disk-operations (11)
 0.00		disk-operations-hard (12)
 0.00		eth0-link-100 (13)
10.93		eth0-link-1000 (14)
 0.00		eth0-link-high (15)
 0.00		eth0-packets (16)
 0.00		eth0-powerunsave (17)
 0.00		eth0-up (18)
 0.20		gpu-operations (19)
 0.00		radio:hci0 (20)
 0.00		radio:phy0 (21)
 0.31		radio:tpacpi_bluetooth_sw (22)
 0.00		runtime-0000:00:00.0 (23)
 0.00		runtime-0000:00:02.0 (24)
 0.00		runtime-0000:00:14.0 (25)
 0.00		runtime-0000:00:16.0 (26)
 0.00		runtime-0000:00:16.3 (27)
 0.00		runtime-0000:00:19.0 (28)
 0.00		runtime-0000:00:1a.0 (29)
 0.00		runtime-0000:00:1b.0 (30)
 0.00		runtime-0000:00:1c.0 (31)
 0.00		runtime-0000:00:1c.1 (32)
 0.00		runtime-0000:00:1c.2 (33)
 0.00		runtime-0000:00:1d.0 (34)
 0.00		runtime-0000:00:1f.0 (35)
 0.00		runtime-0000:00:1f.2 (36)
 0.00		runtime-0000:00:1f.3 (37)
 0.00		runtime-0000:02:00.0 (38)
 0.00		runtime-0000:03:00.0 (39)
 0.00		thinkpad-fan (40)
 0.00		thinkpad-fan-cub (41)
 0.00		thinkpad-fan-sqr (42)
 0.00		thinkpad-light (43)
 0.00		usb-device-0403-6001 (44)
 0.00		usb-device-04e8-6860 (45)
 0.00		usb-device-04e8-6864 (46)
 2.58		usb-device-04f2-b2ea (47)
 0.00		usb-device-058f-6387 (48)
 0.00		usb-device-091e-0003 (49)
 1.34		usb-device-0a5c-21e6 (50)
 9.82		usb-device-1050-0010 (51)
 0.00		usb-device-18d1-4ee2 (52)
 0.00		usb-device-18d1-4ee4 (53)
 0.00		usb-device-1d6b-0002 (54)
 0.00		usb-device-1d6b-0003 (55)
 0.00		usb-device-8087-0024 (56)
 0.00		usb0-link-100 (57)
 0.00		usb0-link-1000 (58)
 0.00		usb0-link-high (59)
 0.00		usb0-packets (60)
 0.00		usb0-powerunsave (61)
 0.00		usb0-up (62)
 0.00		vboxnet0-link-100 (63)
 0.00		vboxnet0-link-1000 (64)
 0.00		vboxnet0-link-high (65)
 0.00		vboxnet0-packets (66)
 0.00		vboxnet0-powerunsave (67)
 0.00		vboxnet0-up (68)
 0.00		wlan0-link-100 (69)
 0.00		wlan0-link-1000 (70)
 0.00		wlan0-link-high (71)
 0.00		wlan0-packets (72)
 1.64		wlan0-powerunsave (73)
 0.00		wlan0-up (74)
 0.00		xwakes (75)

Score:    2.6  (104691.5)
Guess:   13.2
Actual:  13.6
----------------------------------


-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/