Intel i7-4800MQ CPU Power Consuming is much higher than Windows

On Windows 8.1, I run CPU-Z to generate these information:
Processor 1 ID = 0
Number of cores 4 (max 8)
Number of threads 8 (max 16)
Name Intel Core i7 4800MQ
Codename Haswell
Specification Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz
Package (platform ID) Socket 947 rPGA (0x4)
Core Stepping C0
Technology 22 nm
TDP Limit 47 Watts
***Core Speed 799.0 MHz***
Multiplier x Bus Speed 8.0 x 99.9 MHz
Stock frequency 2700 MHz
Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x, AES, AVX, AVX2, FMA3
Turbo Mode supported, enabled
Max non-turbo ratio 27x
Max turbo ratio 37x
Max efficiency ratio 8x
You see: This CPU can run at 800MHz(Core Voltage 0.6 v) on windows, when there is no CPU toast Task. The fan is quiet.
===========================================================
But on Arch Linux, I run the latest i7z-git, I got these information:
Cpu speed from cpuinfo 2693.00Mhz
cpuinfo might be wrong if cpufreq is enabled. To guess correctly try estimating via tsc
Linux's inbuilt cpu_khz code emulated now
True Frequency (without accounting Turbo) 2693 MHz
CPU Multiplier 27x || Bus clock frequency (BCLK) 99.74 MHz
Socket [0] - [physical cores=4, logical cores=8, max online cores ever=4]
TURBO ENABLED on 4 Cores, Hyper Threading ON
Max Frequency without considering Turbo 2792.74 MHz (99.74 x [28])
Max TURBO Multiplier (if Enabled) with 1/2/3/4 Cores is 37x/36x/35x/35x
Real Current Frequency 2653.53 MHz [99.74 x 26.60] (Max of below)
Core [core-id] :Actual Freq (Mult.) C0% Halt(C1)% C3 % C6 % C7 % Temp VCo
Core 1 [0]: 2625.75 (26.33x) 2.45 16.6 1 2.39 77.6 40 0.89
Core 2 [1]: 2653.53 (26.60x) 1 1.14 2.44 1 94.4 40 0.89
Core 3 [2]: 2628.92 (26.36x) 1.41 4.7 1 0 92.9 42 0.89
Core 4 [3]: 2631.18 (26.38x) 2.29 20.4 1.44 1 74.9 39 0.89
CPU can only run at 2.7Ghz (or higher in turbo model), and Core Voltage is 0.89 v. Tha fan is very noisy.
I try many method in CPU power saving, but can not find the solution. Is there any diffierent in power management between Linux and windows?

Gusar wrote:
silenceleaf wrote:I compare the power consuming with windows.
How exactly? That was my question. Just the voltage report? Or do you actually notice something is not right, like shorter battery life? Different tools could possibly measure things differently. Try turbostat, it's in AUR.
Fan management can also be unrelated to actual power consumption. I've wondered before whether pstate, because it works differently, is confusing whatever is responsible for controlling the fans. What brand of laptop do you have? Post the output of lsmod.
And again, just because a tool says the frequency is at 2700MHz, does not mean the processor is actually at that frequency! It is not most of the time.
Thank you for your help.
I am using dell M4800 laptop which have a 97Wh battery. Mainly browing web page and typing some documents. In windows, its battery can last for 5 hours. In linux, it can only last 3 hours.
I am also trying to find more evidence to compare the power consuming between these two platforms. I understand your meaning. It is hard to fairly compare these two environment. I am strill trying to find more information.
lsmod output
Module Size Used by
rfcomm 50698 12
btusb 19648 0
hid_generic 1153 0
snd_usb_audio 117811 2
uvcvideo 72804 0
videobuf2_vmalloc 3304 1 uvcvideo
snd_usbmidi_lib 19755 1 snd_usb_audio
videobuf2_memops 2335 1 videobuf2_vmalloc
snd_rawmidi 18742 1 snd_usbmidi_lib
videobuf2_core 28243 1 uvcvideo
snd_seq_device 5180 1 snd_rawmidi
videodev 111840 2 uvcvideo,videobuf2_core
media 11719 2 uvcvideo,videodev
usbhid 40545 0
hid 90902 2 hid_generic,usbhid
ctr 3831 2
ccm 7894 2
nvidia 10621191 2
snd_hda_codec_hdmi 36379 1
joydev 9631 0
mousedev 10247 0
dell_wmi 1485 0
sparse_keymap 3146 1 dell_wmi
bnep 13053 2
bluetooth 326343 30 bnep,btusb,rfcomm
arc4 2000 2
x86_pkg_temp_thermal 6991 0
intel_powerclamp 8802 0
coretemp 6358 0
kvm_intel 131532 0
kvm 396221 1 kvm_intel
crct10dif_pclmul 4682 0
crct10dif_common 1372 1 crct10dif_pclmul
crc32_pclmul 2923 0
crc32c_intel 14185 0
ghash_clmulni_intel 4405 0
aesni_intel 45548 4
aes_x86_64 7399 1 aesni_intel
lrw 3565 1 aesni_intel
gf128mul 5858 1 lrw
glue_helper 4417 1 aesni_intel
ablk_helper 2004 1 aesni_intel
cryptd 8409 3 ghash_clmulni_intel,aesni_intel,ablk_helper
snd_hda_codec_realtek 45083 1
iTCO_wdt 5407 0
iTCO_vendor_support 1929 1 iTCO_wdt
ppdev 7118 0
fuse 76830 3
dell_laptop 12389 0
dcdbas 6463 1 dell_laptop
iwlmvm 136091 0
mac80211 474777 1 iwlmvm
microcode 15216 0
iwlwifi 140001 1 iwlmvm
i2c_i801 11269 0
psmouse 88171 0
pcspkr 2027 0
evdev 11045 22
serio_raw 5009 0
i915 725519 5
snd_hda_intel 37352 4
cfg80211 408167 3 iwlwifi,mac80211,iwlmvm
snd_hda_codec 150017 3 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel
snd_hwdep 6332 2 snd_usb_audio,snd_hda_codec
snd_pcm 77822 4 snd_usb_audio,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
intel_agp 10872 1 i915
intel_gtt 12664 2 i915,intel_agp
snd_page_alloc 7298 2 snd_pcm,snd_hda_intel
drm_kms_helper 35710 1 i915
snd_timer 18718 1 snd_pcm
rfkill 15651 5 cfg80211,bluetooth,dell_laptop
drm 239102 5 i915,drm_kms_helper,nvidia
lpc_ich 13368 0
i2c_algo_bit 5391 1 i915
i2c_core 24760 7 drm,i915,i2c_i801,drm_kms_helper,i2c_algo_bit,nvidia,videodev
mei_me 9552 0
snd 59029 23 snd_hda_codec_realtek,snd_usb_audio,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_rawmidi,snd_usbmidi_lib,snd_hda_codec,snd_hda_intel,snd_seq_device
mei 62803 1 mei_me
soundcore 5418 1 snd
e1000e 222900 0
ptp 8244 1 e1000e
pps_core 8833 1 ptp
shpchp 25425 0
thermal 8556 0
wmi 8251 1 dell_wmi
parport_pc 19479 0
parport 30517 2 ppdev,parport_pc
video 11425 1 i915
ac 3334 0
battery 7565 0
processor 24620 0
button 4605 1 i915
vboxdrv 264122 0
msr 2565 0
ext4 473259 2
crc16 1359 2 ext4,bluetooth
mbcache 6074 1 ext4
jbd2 80912 1 ext4
sr_mod 14930 0
sd_mod 31361 5
cdrom 34880 1 sr_mod
atkbd 16806 0
libps2 4187 2 atkbd,psmouse
ahci 23048 3
libahci 21698 1 ahci
libata 172104 2 ahci,libahci
sdhci_pci 12604 0
ehci_pci 3928 0
sdhci 28820 1 sdhci_pci
xhci_hcd 144681 0
ehci_hcd 64171 1 ehci_pci
scsi_mod 132250 3 libata,sd_mod,sr_mod
mmc_core 95465 2 sdhci,sdhci_pci
usbcore 180320 8 btusb,snd_usb_audio,uvcvideo,snd_usbmidi_lib,ehci_hcd,ehci_pci,usbhid,xhci_hcd
usb_common 1648 1 usbcore
i8042 13366 2 libps2,dell_laptop
serio 10721 6 serio_raw,atkbd,i8042,psmouse

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Message Edited by Ravens Fan on 04-16-2007 02:30 PM

Intel i7-4800MQ CPU Power Consuming is much higher than Windows

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