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Op 22 jun 2008, om 14:51 heeft Woodruff, Richard het volgende
geschreven:
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 0.0%)
C0 0.0ms ( 0.0%)
C1 188.9ms (0.7%)*
C2 2036.1ms (8.0%)*
C3 23285.1ms (91.3%)*
Wakeups-from-idle per second : 61.7 interval: 3.0s
Top causes for wakeups:
44.9% ( 57.7) <interrupt> : musb_hdrc.0
17.9% ( 23.0) <interrupt> : gp timer
14.3% ( 18.3) USB device 2-1.2 : LCD2USB Interface (Till Harbaum)
9.9% ( 12.7) lcd4linux : do_nanosleep (hrtimer_wakeup)
7.5% ( 9.7) USB device 2-1.4 : Linksys USB2.0 Network Adapter
(USB)
3.9% ( 5.0) Xfbdev : fbcon_add_cursor_timer
(cursor_timer_handler)
0.5% ( 0.7) hald : schedule_timeout
(process_timeout)
0.3% ( 0.3) dropbear : sk_reset_timer (tcp_write_timer)
0.3% ( 0.3) <kernel core> : neigh_table_init_no_netlink
(neigh_periodic_timer)
0.3% ( 0.3) pulseaudio : schedule_timeout
(process_timeout)
0.3% ( 0.3) init : schedule_timeout
(process_timeout)
The dispc crashes are gone and I get fewer wakeups per second :)
regards,
Koen
* There's a bug in powertop 1.10 that reports percentages wrong, so
the percentages where approximated by hand.
C0 (cpu running) ( 0.0%)
C0 0.0ms ( 0.0%)
C1 176.5ms ( 4.7%)
C2 3601.7ms (4090.7%)
C3 17956.3ms (92938.0%)
Those C-State residency times are clearly wrong also.
If you try hard with a minimal kernel the maximum sleep you can get
is like 1.5 seconds. The kernel has some hard coded timers with 1
to 2 second periods (like slab cache reaper threads).
For our non-edge kernel code these things report about right. As
long as you have a 99.9% duty cycle of OFF to ON you get pretty good
savings.
The wake up information should be about right. Your USB Networking
with MUSB will probably assure you of never getting ultra low power
numbers but probably good for development.
What is that USB2LCD device?
http://www.harbaum.org/till/lcd2usb/index.shtml driven by the
lcd4linux app, which is quite x86 oriented, so not very powersaving
friendly, I did save ~100 wake-ups/s by using libusb1+libusbcompat
over libusb.
regards,
Koen
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