[maemo-users] N900 power usage entrail reading skills (aka powertop output)
From: Marius Gedminas marius at pov.ltDate: Mon Apr 26 17:47:35 EEST 2010
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I get the feeling that my N900 eats through its battery quicker than it
used to. I'm not sure when it started, maybe when I upgraded to
RX-51_2009SE_3.2010.02-8_PR_MR0 firmware? It could very well be some
app's fault.
Here's what powertop says. Note that the CPU is spending almost 100%
time at 500 MHz. Any clues? The word 'mmc' shows up quite a lot and
pretty high up, but what could be causing all that IO, if that's IO I'm
seeing? top is not very informative; the highest-CPU-using process is
'top' itself at 1.5%. iotop doesn't run on Maemo (Linux >= 2.6.20 with
I/O accounting support: Not found)
Powertop 1.13.3
status: Unknown job: pmtrackerdaemon
Sleeping for 11 seconds before sampling
Collecting data for 30 seconds
Sample interval was 00m 30s 9217us
C# | Ratio | Avg/dura | Frequency | Ratio
--------+--------+----------+-----------+--------+
C0 | 43.3% | | 600 MHz | 3.1% |
C1 | 4.6% | 0.5ms | 550 MHz | 0.0% |
C2 | 45.2% | 4.7ms | 500 MHz | 96.4% |
C3 | 6.8% | 19.1ms | 250 MHz | 0.5% |
C4 | 0.0% | |
IRQ# | Activity | Type | Name
--------+------------+----------------+---------------------------
12 | 7410 | INTC | DMA
86 | 5456 | INTC | mmc1
37 | 2433 | INTC | gp
11 | 611 | INTC | prcm
56 | 90 | INTC | i2c_omap
57 | 43 | INTC | i2c_omap
202 | 19 | GPIO | wl1251
PID# | Activity | Name | Function Entry (Expire)
--------+------------+----------------+---------------------------
0 | 2365 | <kernel core> | tick_nohz_restart_sched_tick (tick_sched_timer)
492 | 192 | mmcqd | cfq_completed_request (cfq_idle_slice_timer)
37 | 94D| awk | cpufreq_governor_dbs (delayed_work_timer_fn)
1087 | 30 | hildon-desktop | schedule_hrtimeout_range (hrtimer_wakeup)
492 | 22 | mmcqd | queue_delayed_work (delayed_work_timer_fn)
464 | 12 | wl12xx | schedule_timeout (process_timeout)
464 | 12 | wl12xx | queue_delayed_work (delayed_work_timer_fn)
1370 | 11 |hildon-thumbnai | blk_plug_device (blk_unplug_timeout)
25268 | 10 | skyhost | futex_wait (hrtimer_wakeup)
25262 | 8 | skyhost | do_nanosleep (hrtimer_wakeup)
706 | 8 | bme_RX-51 | sys_timer_settime (posix_timer_fn)
0 | 7 | <kernel core> | hrtimer_start (tick_sched_timer)
29 | 6 | mount | setup_wb_timer (wb_timer_fn)
464 | 4 | wl12xx | schedule_timeout (process_timeout)
1140 | 4 | wlancond | ieee80211_ioctl_siwpower (ieee80211_dynamic_ps_timer)
747 | 4 | avahi-daemon | schedule_hrtimeout_range (hrtimer_wakeup)
686 | 3 | dsme | do_nanosleep (hrtimer_wakeup)
686 | 3 | dsme | __enqueue_rt_entity (sched_rt_period_timer)
17887 | 3 | pdflush | blk_plug_device (blk_unplug_timeout)
15 | 3 | kswapd0 | schedule_timeout (process_timeout)
0 | 2 | <kernel core> | queue_delayed_work (delayed_work_timer_fn)
706 | 2 | bme_RX-51 | do_nanosleep (hrtimer_wakeup)
706 | 2 | bme_RX-51 | schedule_timeout (process_timeout)
10 | 2 | omap2_mcspi | neigh_add_timer (neigh_timer_handler)
1 | 2D| <kernel core> | queue_delayed_work (delayed_work_timer_fn)
1370 | 2 |hildon-thumbnai | journal_get_write_access (commit_timeout)
1584 | 2 | FBReader | schedule_hrtimeout_range (hrtimer_wakeup)
25477 | 1 | sshd | sk_reset_timer (tcp_write_timer)
706 | 1 | bme_RX-51 | sys_timer_settime (posix_timer_fn)
1097 | 1 |e-addressbook-f | schedule_timeout (process_timeout)
1370 | 1 |hildon-thumbnai | schedule_timeout (process_timeout)
17887 | 1 | pdflush | journal_get_write_access (commit_timeout)
1 | 1 | <kernel core> | inet_initpeers (peer_check_expire)
716 | 1 | dbus-daemon | schedule_hrtimeout_range (hrtimer_wakeup)
927 | 1 | dbus-daemon | schedule_hrtimeout_range (hrtimer_wakeup)
25557 | 1 | powertop | do_nanosleep (hrtimer_wakeup)
Power domain activity breakdown
Domain | % of time spent in states
--------+---------+---------+---------+---------+----------
usbhost |OFF: 100%|RET: 0%|INA: 0%| ON: 0%| now:(OFF)
sgx |OFF: 100%|RET: 0%|INA: 0%| ON: 0%| now:(OFF)
per |OFF: 0%|RET: 51%|INA: 0%| ON: 48%| now:(ON)
dss |OFF: 100%|RET: 0%|INA: 0%| ON: 0%| now:(OFF)
cam |OFF: 100%|RET: 0%|INA: 0%| ON: 0%| now:(OFF)
core |OFF: 0%|RET: 0%|INA: 0%| ON: 100%| now:(ON)
neon |OFF: 0%|RET: 6%|INA: 44%| ON: 48%| now:(ON)
mpu |OFF: 0%|RET: 6%|INA: 44%| ON: 48%| now:(ON)
iva2 |OFF: 100%|RET: 0%|INA: 0%| ON: 0%| now:(OFF)
Clock activity breakdown at end of period
Domain | Active clocks
--------+---------------+---------------+------------------
core | SDRC | HSOTGUSB_IDLE | OMAPCTRL
| MAILBOXES | MMC2 |
core3 | USBTLL
wkup | GPT1 | 32KSYNC | GPIO1
| WDT1 |
ckgen | CORE | PERI | 96M
| 48M | 12M | 54M
| EMU_CORE |
per | GPIO2 | GPIO3 | GPIO4
| GPIO5 | GPIO6 |
Total wakeups 18886, 629.5/s | IRQ 16062, 535.4/s | Timers 2824, 94.1/s
HW wakeups 99, 3.3/s | Real gp_timers expired 129, 4.3/s
I generally have the following apps running:
- FBReader
- xterm with vim inside
and then there's
- WiFi and/or 3G connectivity (Bluetooth generally off)
- 5 IM accounts (Jabber, Google Talk, Facebook, Skype, Empathy
link-local-thing-that-I-never-remember-the-name-of) with GPS
positioning disabled
- Avahi, SSH and Battery Eye daemons
- Foreca weather, Facebook, Personal IP address and GPRS data monitor
applets.
Marius Gedminas
--
Cheap, Fast, Good -- pick two.
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