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0.3% ( 1.0) vdr : do_nanosleep (hrtimer_wakeup)
0.3% ( 1.0) vdr : do_nanosleep (hrtimer_wakeup)
0.3% ( 1.0) tail : do_nanosleep (hrtimer_wakeup)
0.3% ( 1.0) tail : do_nanosleep (hrtimer_wakeup)


--------------------------------------------with force pid filter
================================ zap
PowerTOP version 1.10 (C) 2007 Intel Corporation

Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 2.4%) 750 Mhz 0.0%
polling 0.0ms ( 0.0%) 563 Mhz 0.0%
C1 halt 0.0ms ( 0.0%) 375 Mhz 0.0%
C2 0.0ms ( 0.0%) 188 Mhz 100.0%
C3 7.4ms (97.6%)

Wakeups-from-idle per second : 131.8 interval: 15.0s
no ACPI power usage estimate available

Top causes for wakeups:
51.3% (136.1) /sys/bus/usb/devices/5-1
42.7% (113.2) <interrupt> : uhci_hcd:usb1, HDA Intel, ehci_hcd:usb5
2.6% ( 7.0) zap : schedule_timeout (process_timeout)
0.8% ( 2.0) xfsaild : schedule_timeout (process_timeout)
0.6% ( 1.6) xfsbufd : schedule_timeout (process_timeout)
0.4% ( 1.0) ifconfig : b44_open (b44_timer)
0.4% ( 1.0) zap : do_nanosleep (hrtimer_wakeup)
0.3% ( 0.7) kdvb-ad-0-fe-0 : schedule_timeout (process_timeout)

================================= vdr

PowerTOP version 1.10 (C) 2007 Intel Corporation

Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 9.4%) 750 Mhz 0.0%
polling 0.0ms ( 0.0%) 563 Mhz 0.0%
C1 halt 0.0ms ( 0.0%) 375 Mhz 0.0%
C2 0.1ms ( 0.1%) 188 Mhz 100.0%
C3 2.7ms (90.5%)

Wakeups-from-idle per second : 345.1 interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
42.7% (221.9) vdr : futex_wait (hrtimer_wakeup)
27.7% (143.7) /sys/bus/usb/devices/5-1
22.3% (115.8) <interrupt> : uhci_hcd:usb1, HDA Intel, ehci_hcd:usb5
2.5% ( 13.0) vdr : schedule_timeout (process_timeout)
1.4% ( 7.2) <kernel module> : ehci_work (ehci_watchdog)
1.3% ( 6.5) <interrupt> : uhci_hcd:usb3, eth0
0.4% ( 2.0) xfsaild : schedule_timeout (process_timeout)
0.3% ( 1.6) xfsbufd : schedule_timeout (process_timeout)
0.2% ( 1.0) ifconfig : b44_open (b44_timer)
0.2% ( 1.0) vdr : do_nanosleep (hrtimer_wakeup)
0.2% ( 1.0) tail : do_nanosleep (hrtimer_wakeup)
0.1% ( 0.6) kdvb-ad-0-fe-0 : schedule_timeout (process_timeout)



</pre>
</pre>

Revision as of 08:56, 6 April 2009

System Load

Comparison

Device MSI DigiVOX
mini II V3.0
Fujitsu-Siemens DVB-T
Mobile TV Tuner
Toshiba USB DVB-T
Tuner PX1211E-1TVD
Sino Video SV3420B
Picture
Dvb-t-usb-msi-digivox-ii-rev3-001.jpg
todo
Dvb-t-usb-toshiba-px1211e-1tvd-001.jpg
Dvb-t-usb-sinovideo-sv3420b-005.jpg
driver af9015 vp7045 dib3000mc ec168
zap w/o
pid filter
30.2 5.8 5.8 todo
vdr w/o
pid filter
37.0 14.8 14.4 todo
zap with
pid filter
1.1 - 0.5 todo
vdr with
pid filter
18.7 - 9.7 todo

Detailed powertop measurements

More details:

I ran zap and vdr on a system that is idle. Without zap or vdr the system does about 5 wakups per second and spends about 0.1% of its time in C0 (cpu running).

Polling of the remote is disabled using the module option disable_rc_polling=1 for the dvb_usb module. The hardware PID filter is enabled with the option force_pid_filter_usage=1 for the same module.

vdr is the one from e-tobi.net/vdr-experimental lenny vdr-extensions here's the list of plugins that were enabled during the test: | Searching for plugins (VDR 1.6.0-2/1.6.0) (cache hit): epgsearch quickepgsearch conflictcheckonly live epgsearchonly ffnetdev streamdev-server.


MSI DigiVOX mini II rev.3

Compiled and installed according to the instructions on MSI_DigiVox_mini_II_V3.0.

The device has a hardware PID filter, but the maximum block size for transfers over USB seems to be limited to 512.


#####################################################
==================== remote disabled, pid filter disabled
------------------ running zap


     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (30.2%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.4ms (49.7%)          188 Mhz   100.0%
C3                0.1ms (20.1%)

Wakeups-from-idle per second : 3205.5   interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  59.6% (4761.9)   USB device  5-1 : DVB-T 2 (Afatech)
  40.2% (3206.1)       <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
   0.1% (  5.7)               zap : schedule_timeout (process_timeout)
   0.0% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.0% (  1.8)           xfsbufd : schedule_timeout (process_timeout)

------------------- running vdr

     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (37.0%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.4ms (21.2%)          188 Mhz   100.0%
C3                0.2ms (41.8%)

Wakeups-from-idle per second : 2507.8   interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  58.9% (4300.1)   USB device  5-1 : DVB-T 2 (Afatech)
  37.6% (2744.9)       <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
   3.0% (220.7)               vdr : futex_wait (hrtimer_wakeup)
   0.2% ( 12.9)       <interrupt> : rtc0
   0.1% (  6.0)               vdr : schedule_timeout (process_timeout)
   0.1% (  5.3)               vdr : hrtick_set (hrtick)
   0.0% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.0% (  1.6)           xfsbufd : schedule_timeout (process_timeout)

#######################################

------------------ remote disabled, pid filter enabled:
------------------ running zap

     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 1.1%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.0ms ( 0.0%)          188 Mhz   100.0%
C3               10.6ms (98.9%)

Wakeups-from-idle per second : 96.2     interval: 15.0s
no ACPI power usage estimate available

Top causes for wakeups:
  50.3% ( 72.9)       <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
  34.3% ( 49.7)   USB device  5-1 : DVB-T 2 (Afatech)
   5.7% (  8.2)     <kernel core> : ehci_work (ehci_watchdog)
   3.8% (  5.5)               zap : schedule_timeout (process_timeout)
   1.4% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   1.1% (  1.6)           xfsbufd : schedule_timeout (process_timeout)

------------------ running vdr

     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (18.7%)          750 Mhz     0.0%
polling           0.1ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.1ms ( 0.3%)          188 Mhz   100.0%
C3                0.8ms (81.0%)

Wakeups-from-idle per second : 1044.2   interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  49.4% (1137.5)   USB device  5-1 : DVB-T 2 (Afatech)
  40.1% (922.4)       <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
   9.6% (220.8)               vdr : futex_wait (hrtimer_wakeup)
   0.3% (  6.2)               vdr : schedule_timeout (process_timeout)
   0.2% (  5.6)     <kernel core> : ehci_work (ehci_watchdog)
   0.1% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.1% (  1.6)           xfsbufd : schedule_timeout (process_timeout)
   0.0% (  1.0)               vdr : do_nanosleep (hrtimer_wakeup)

#########################################


Fujitsu-Siemens DVB-T Mobile TV Tuner

It doesn't have a hardware PID filter but uses 4096 byte bulk transfers over USB. Thus has less USB protocol overhead.

--------------------------- without remote, without pid filter
------------------ zap
     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 5.7%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.0ms ( 0.0%)          188 Mhz   100.0%
C3                2.0ms (94.3%)

Wakeups-from-idle per second : 473.5    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  55.7% (592.2)   USB device  5-1 : DVB-T 2 (Afatech)
  42.9% (455.9)       <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
   0.5% (  5.7)               zap : schedule_timeout (process_timeout)
   0.2% (  2.4)    kdvb-ad-0-fe-0 : schedule_timeout (process_timeout)
   0.2% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.2% (  1.6)           xfsbufd : schedule_timeout (process_timeout)
   0.1% (  1.0)               zap : do_nanosleep (hrtimer_wakeup)

-------------------- vdr
     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (13.0%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.1ms ( 0.1%)          188 Mhz   100.0%
C3                1.5ms (86.8%)

Wakeups-from-idle per second : 611.1    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  45.1% (540.5)   USB device  5-1 : DVB-T 2 (Afatech)
  34.9% (418.2)       <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
  18.4% (220.8)               vdr : futex_wait (hrtimer_wakeup)


--------------------------


Toshiba USB DVB-T TV PX1211E-1TVD

This device has a hardware PID filter and uses 4096 Byte bulk transfers.

[329345.857835] dvb-usb: found a 'LITE-ON USB2.0 DVB-T Tuner' in warm state.
[329345.859820] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
[329345.862374] DVB: registering new adapter (LITE-ON USB2.0 DVB-T Tuner)
[329345.875554] DVB: registering adapter 0 frontend 0 (DiBcom 3000MC/P)...
[329345.898401] MT2060: successfully identified (IF1 = 1220)
[329346.390290] dvb-usb: LITE-ON USB2.0 DVB-T Tuner successfully initialized and connected.
[329346.390729] usbcore: registered new interface driver dvb_usb_dibusb_mc


===================================== without pid filter
============ zap
     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 5.8%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.1ms ( 0.0%)          188 Mhz   100.0%
C3                2.0ms (94.2%)

Wakeups-from-idle per second : 484.0    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  55.9% (611.8)   USB device  5-1 : DVB-T 2 (Afatech) 
  42.9% (469.2)       <interrupt> : uhci_hcd:usb1, HDA Intel, ehci_hcd:usb5 
   0.5% (  5.5)               zap : schedule_timeout (process_timeout)
   0.2% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.1% (  1.6)           xfsbufd : schedule_timeout (process_timeout)
   0.1% (  1.0)          ifconfig : b44_open (b44_timer)

============  vdr
     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (14.4%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.1ms ( 0.1%)          188 Mhz   100.0%
C3                1.4ms (85.5%)

Wakeups-from-idle per second : 612.7    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  45.5% (553.0)   USB device  5-1 : DVB-T 2 (Afatech) 
  35.0% (425.9)       <interrupt> : uhci_hcd:usb1, HDA Intel, ehci_hcd:usb5 
  18.2% (221.0)               vdr : futex_wait (hrtimer_wakeup) 
   0.5% (  6.0)               vdr : schedule_timeout (process_timeout)
   0.2% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.1% (  1.6)           xfsbufd : schedule_timeout (process_timeout)
   0.1% (  1.0)              tail : do_nanosleep (hrtimer_wakeup)
   0.1% (  1.0)               vdr : do_nanosleep (hrtimer_wakeup)
   0.1% (  1.0)          ifconfig : b44_open (b44_timer)
   0.1% (  0.7)               vdr : hrtick_set (hrtick)


=================================with pid filter
==================== zap
     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 0.5%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.0ms ( 0.0%)          188 Mhz   100.0%
C3               36.1ms (99.5%)

Wakeups-from-idle per second : 27.6     interval: 20.0s
no ACPI power usage estimate available

Top causes for wakeups:
  31.2% ( 10.0)           syslogd : ehci_irq (ehci_watchdog) 
  29.0% (  9.3)               zap : schedule_timeout (process_timeout)
   8.7% (  2.8)       <interrupt> : uhci_hcd:usb1, HDA Intel, ehci_hcd:usb5
   6.2% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   5.8% (  1.9)   USB device  5-1 : DVB-T 2 (Afatech)
   5.3% (  1.7)           xfsbufd : schedule_timeout (process_timeout)
   3.1% (  1.0)          ifconfig : b44_open (b44_timer)
   3.1% (  1.0)               zap : do_nanosleep (hrtimer_wakeup)

===================== vdr
     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 9.7%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.1ms ( 0.0%)          188 Mhz   100.0%
C3                2.7ms (90.2%)

Wakeups-from-idle per second : 342.1    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  43.0% (221.0)               vdr : futex_wait (hrtimer_wakeup) 
  28.0% (144.0)   USB device  5-1 : DVB-T 2 (Afatech) 
  24.7% (126.9)       <interrupt> : uhci_hcd:usb1, HDA Intel, ehci_hcd:usb5 
   1.3% (  6.9)           syslogd : ehci_irq (ehci_watchdog)
   1.2% (  6.0)               vdr : schedule_timeout (process_timeout)
   0.4% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.3% (  1.6)           xfsbufd : schedule_timeout (process_timeout)
   0.2% (  1.0)               vdr : do_nanosleep (hrtimer_wakeup)
   0.2% (  1.0)          ifconfig : b44_open (b44_timer)
   0.1% (  0.6)    kdvb-ad-0-fe-0 : schedule_timeout (process_timeout)
=====================================

SinoVideo 3420B

The name and number schema seems a little intransparent for the whole family of devices. But they are cheap as chips. I picked up mine new via ebay from a Chinese shop for less than 6 Euros (+PP), including remote and antenna.


[1217714.429823] usb 5-1: new high speed USB device using ehci_hcd and address 11
[1217714.561392] usb 5-1: configuration #1 chosen from 1 choice
[1217714.572099] input: HID 18b4:1689 as /class/input/input9
[1217714.600549] input,hidraw0: USB HID v1.11 Keyboard [HID 18b4:1689] on usb-0000:00:1d.7-1
[1217714.601760] usb 5-1: New USB device found, idVendor=18b4, idProduct=1689
[1217714.601896] usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0

Without any driver the device is already recognized as keyboard.

[1220628.851806] dvb-usb: found a 'E3C EC168 DVB-T USB2.0 reference design' in cold state, will try to load a firmware
[1220628.852984] firmware: requesting dvb-usb-ec168.fw
[1220629.527759] dvb-usb: downloading firmware from file 'dvb-usb-ec168.fw'
[1220629.551527] dvb-usb: found a 'E3C EC168 DVB-T USB2.0 reference design' in warm state.
[1220629.552845] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
[1220629.554959] DVB: registering new adapter (E3C EC168 DVB-T USB2.0 reference design)
[1220629.558609] DVB: registering adapter 0 frontend 0 (E3C EC100 DVB-T)...
[1220629.559342] MXL5005S: Attached at address 0xc6
[1220629.560823] dvb-usb: E3C EC168 DVB-T USB2.0 reference design successfully initialized and connected.
[1220629.561204] usbcore: registered new interface driver dvb_usb_ec168

After compiling the ec168 driver as described in a possible way to get the ec168 working the device is registered by the dvb_usb framework.

Having it recognized as usb keyboard causes additional 10 wakups per second and an idle load in C0 of 0.4%. I unloaded the usbhid module to have the same baseline for my load tests.

====================================== running zap
     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 2.3%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.1ms ( 0.0%)          188 Mhz   100.0%
C3                7.4ms (97.7%)

Wakeups-from-idle per second : 132.2    interval: 15.0s
no ACPI power usage estimate available

Top causes for wakeups:
  51.2% (135.7)   USB device  5-1 : TvTUNER (SKGZ)
  42.7% (113.1)       <interrupt> : uhci_hcd:usb1, HDA Intel, ehci_hcd:usb5
   2.7% (  7.1)               zap : schedule_timeout (process_timeout)
   0.8% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.7% (  1.7)           xfsbufd : schedule_timeout (process_timeout)
   0.4% (  1.0)          ifconfig : b44_open (b44_timer)
   0.4% (  1.0)               zap : do_nanosleep (hrtimer_wakeup)
   0.2% (  0.6)    kdvb-ad-0-fe-0 : schedule_timeout (process_timeout)


======================================= running vdr
     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 4.4%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.1ms ( 0.0%)          188 Mhz   100.0%
C3                3.5ms (95.6%)

Wakeups-from-idle per second : 278.3    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  70.8% (222.8)               vdr : futex_wait (hrtimer_wakeup)
   7.9% ( 24.7)       <interrupt> : uhci_hcd:usb1, HDA Intel, ehci_hcd:usb5
   7.4% ( 23.3)   /sys/bus/usb/devices/5-1
   6.3% ( 19.7)               vdr : schedule_timeout (process_timeout)
   4.4% ( 13.8)   <kernel module> : ehci_work (ehci_watchdog)
   0.6% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.5% (  1.6)           xfsbufd : schedule_timeout (process_timeout)
   0.3% (  1.0)          ifconfig : b44_open (b44_timer)
   0.3% (  1.0)               vdr : do_nanosleep (hrtimer_wakeup)
   0.3% (  1.0)              tail : do_nanosleep (hrtimer_wakeup)


--------------------------------------------with force pid filter 
================================ zap
     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 2.4%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.0ms ( 0.0%)          188 Mhz   100.0%
C3                7.4ms (97.6%)

Wakeups-from-idle per second : 131.8    interval: 15.0s
no ACPI power usage estimate available

Top causes for wakeups:
  51.3% (136.1)   /sys/bus/usb/devices/5-1
  42.7% (113.2)       <interrupt> : uhci_hcd:usb1, HDA Intel, ehci_hcd:usb5
   2.6% (  7.0)               zap : schedule_timeout (process_timeout)
   0.8% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.6% (  1.6)           xfsbufd : schedule_timeout (process_timeout)
   0.4% (  1.0)          ifconfig : b44_open (b44_timer)
   0.4% (  1.0)               zap : do_nanosleep (hrtimer_wakeup)
   0.3% (  0.7)    kdvb-ad-0-fe-0 : schedule_timeout (process_timeout)

================================= vdr

     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 9.4%)          750 Mhz     0.0%
polling           0.0ms ( 0.0%)          563 Mhz     0.0%
C1 halt           0.0ms ( 0.0%)          375 Mhz     0.0%
C2                0.1ms ( 0.1%)          188 Mhz   100.0%
C3                2.7ms (90.5%)

Wakeups-from-idle per second : 345.1    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  42.7% (221.9)               vdr : futex_wait (hrtimer_wakeup)
  27.7% (143.7)   /sys/bus/usb/devices/5-1
  22.3% (115.8)       <interrupt> : uhci_hcd:usb1, HDA Intel, ehci_hcd:usb5
   2.5% ( 13.0)               vdr : schedule_timeout (process_timeout)
   1.4% (  7.2)   <kernel module> : ehci_work (ehci_watchdog)
   1.3% (  6.5)       <interrupt> : uhci_hcd:usb3, eth0
   0.4% (  2.0)           xfsaild : schedule_timeout (process_timeout)
   0.3% (  1.6)           xfsbufd : schedule_timeout (process_timeout)
   0.2% (  1.0)          ifconfig : b44_open (b44_timer)
   0.2% (  1.0)               vdr : do_nanosleep (hrtimer_wakeup)
   0.2% (  1.0)              tail : do_nanosleep (hrtimer_wakeup)
   0.1% (  0.6)    kdvb-ad-0-fe-0 : schedule_timeout (process_timeout)