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* A thing of power beauty cpu-idle on arm.
@ 2008-02-13 22:15 Woodruff, Richard
  2008-02-15 23:20 ` Tony Lindgren
  0 siblings, 1 reply; 2+ messages in thread
From: Woodruff, Richard @ 2008-02-13 22:15 UTC (permalink / raw)
  To: linux-omap; +Cc: Dasu, Karthik P, Linux-pm mailing list

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Hi,

A bit of fun is working is slowly working its way to the tree.  After a
couple teaks and a little c-state patch from Kevin Hilman it looks like
powertop will be able to live on ARM/OMAP3.

Our first pass of internal code has come together enough to have cpuidle
+ cpufreq running ++.  Hopefully, after some time and more work that
reference can be leveraged to see the same on kernel.org.  Lots of work
to do on that path...

If the png picture makes it, it can be seen given the load which was
running, all C-States have been touched and most P-States!  The P-State
picture only has ARM displayed, might be nice to see if Intel is open to
listing speed for the other asymmetric processors and the IO domain.
Given the background load residency isn't so great, but OFF mode is
being touched.

In the current definition:
	C0 - wfi
	C1 - wfi + dtick
	C2 - mpu-retention, core-active
	C3 - mpu-off, core-active
	C4 - mpu-ret, core-ret
	C5 - mpu-off, core-ret
	C6 - mpu-off, core-off  (0-volts)

Thanks to Adam Belay for cpuidle work!

Regards,
Richard W.

root@128.247.75.85:/tst# ./powertop-static -d -t 60
PowerTOP 1.9    (C) 2007 Intel Corporation

Collecting data for 60 seconds
Cn                Avg residency
C0 (cpu running)        ( 7.9%)
C1              934.7ms (89.0%)
C2               44.4ms ( 2.7%)
C3                0.0ms ( 0.0%)
C4                5.5ms ( 0.3%)
C5                3.5ms ( 0.2%)
C6                0.4ms ( 0.0%)
P-states (frequencies)
   550 Mhz     8.0%
   500 Mhz     0.0%
   250 Mhz     0.0%
   125 Mhz    92.0%
Wakeups-from-idle per second :  2.9     interval: 60.0s
Top causes for wakeups:
  56.8% ( 12.4)       <interrupt> : 32KHz timer
  11.4% (  2.5)       <interrupt> : prcm
  10.4% (  2.3)       <interrupt> : eth0
   7.3% (  1.6)              bash : queue_delayed_work_on
(delayed_work_timer_fn
)
   4.6% (  1.0)     <kernel core> : __netdev_watchdog_up (dev_watchdog)
   2.3% (  0.5)     <kernel core> : queue_delayed_work_on
(delayed_work_timer_fn
)
   1.5% (  0.3)     <kernel core> : irlmp_start_discovery_timer
(irlmp_discovery
_timer_expired)
   1.5% (  0.3)             mvltd : schedule_timeout (process_timeout)
   1.1% (  0.2)     <kernel core> : neigh_table_init_no_netlink
(neigh_periodic_
timer)
   0.9% (  0.2)     <kernel core> : page_writeback_init (wb_timer_fn)
   0.9% (  0.2)              init : schedule_timeout (process_timeout)
   0.2% (  0.1)     <kernel core> : sk_reset_timer (tcp_delack_timer)
   0.2% (  0.1)        in.telnetd : sk_reset_timer (tcp_write_timerS
   0.2% (  0.1)     <kernel core> : neigh_update (neigh_timer_handler)
   0.2% (  0.0)       <interrupt> : serial
   0.2% (  0.0)     <kernel core> : cache_register
(delayed_work_timer_fn)
   0.1% (  0.0)     <kernel core> : ip_rt_init (rt_check_expire)
   0.1% (  0.0)   powertop-static : schedule_timeout (process_timeout)

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