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SubjectRe: Bootup time regression from 2.6.27 to 2.6.28-rc3+
Date
On Sunday 09 November 2008, Thomas Gleixner wrote:
> Find below the lineup of the timers-fixes-for-linus branch of the tip
> tree (the same as Arjan posted minus the irq fixes)

I've tested with Thomas' patch set on top of v2.6.28-rc3-261-g8b805ef.

The notebook boots normally, but spends way too much time in C0.

Cheers,
FJP


POWERTOP BEFORE
===============
This is somewhere around -rc3-200 with peek_ahead disabled with a return
in the function. System is on battery after having been suspended to RAM
a few times

Note the double C0 and missing P-states.

Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 3.2%)
C0 0.0ms ( 0.0%)
C1 0.0ms ( 0.0%)
C2 0.9ms ( 0.1%)
C4 3.4ms (96.7%)

Wakeups-from-idle per second : 289.1 interval: 10.0s
Power usage (ACPI estimate): 9.8W (4.5 hours)

Top causes for wakeups:
42.8% (136.5) <interrupt> : extra timer interrupt
30.5% ( 97.2) <interrupt> : PS/2 keyboard/mouse/touchpad
12.4% ( 39.5) <kernel IPI> : Rescheduling interrupts
3.6% ( 11.6) <interrupt> : iwlagn
2.5% ( 8.0) <kernel module> : mod_timer (rh_timer_func)
1.7% ( 5.4) artsd : schedule_hrtimeout_range (hrtimer_wakeup)
1.1% ( 3.6) <kernel core> : hrtimer_start (tick_sched_timer)
1.0% ( 3.1) <interrupt> : acpi
0.6% ( 2.0) kicker : schedule_hrtimeout_range (hrtimer_wakeup)
0.4% ( 1.2) klipper : schedule_hrtimeout_range (hrtimer_wakeup)
0.3% ( 1.1) kdesktop : schedule_hrtimeout_range (hrtimer_wakeup)
0.3% ( 1.0) kwifimanager : schedule_hrtimeout_range (hrtimer_wakeup)
0.3% ( 1.0) <kernel core> : enqueue_task_rt (sched_rt_period_timer)
0.3% ( 1.0) artsd : hrtimer_start (it_real_fn)
0.3% ( 1.0) kwrapper : do_nanosleep (hrtimer_wakeup)
0.3% ( 1.0) kwin : schedule_hrtimeout_range (hrtimer_wakeup)
0.3% ( 0.9) Xorg : schedule_hrtimeout_range (hrtimer_wakeup)
0.2% ( 0.5) iwlagn : mod_timer (ieee80211_sta_timer)
0.2% ( 0.5) gpg-agent : schedule_hrtimeout_range (hrtimer_wakeup)
0.2% ( 0.5) hald-addon-stor : schedule_hrtimeout_range (hrtimer_wakeup)


POWERTOP AFTER
==============
Again on battery; P-states are back and the second C0 is now "polling"
(both same as with 2.6.27.4).

System permanently remains very high in C0!
Wakeups go down to ~30 without user input (keyboard/mouse activity), which
is a bit lower than I get with .27.4.

Cn Avg residency P-states (frequencies)
C0 (cpu running) (49.7%) 1333 Mhz 0.0%
polling 0.0ms ( 0.0%) 1200 Mhz 0.0%
C1 0.0ms ( 0.0%) 1067 Mhz 0.0%
C2 7.5ms ( 1.9%) 800 Mhz 100.0%
C4 8.5ms (48.4%)

Wakeups-from-idle per second : 59.6 interval: 15.0s
Power usage (ACPI estimate): 9.7W (4.4 hours)

Top causes for wakeups:
34.6% ( 36.3) <interrupt> : PS/2 keyboard/mouse/touchpad
16.0% ( 16.7) <kernel IPI> : Rescheduling interrupts
8.9% ( 9.3) <interrupt> : iwlagn
8.4% ( 8.8) <interrupt> : extra timer interrupt
7.8% ( 8.1) <kernel module> : mod_timer (rh_timer_func)
5.6% ( 5.9) <kernel core> : hrtimer_start (tick_sched_timer)
5.2% ( 5.4) artsd : schedule_hrtimeout_range (hrtimer_wakeup)
2.9% ( 3.0) kicker : schedule_hrtimeout_range (hrtimer_wakeup)
1.1% ( 1.2) kdesktop : schedule_hrtimeout_range (hrtimer_wakeup)
1.0% ( 1.1) Xorg : schedule_hrtimeout_range (hrtimer_wakeup)
1.0% ( 1.0) kwifimanager : schedule_hrtimeout_range (hrtimer_wakeup)
1.0% ( 1.0) artsd : hrtimer_start (it_real_fn)
1.0% ( 1.0) kwrapper : do_nanosleep (hrtimer_wakeup)
1.0% ( 1.0) kwin : schedule_hrtimeout_range (hrtimer_wakeup)
1.0% ( 1.0) klipper : schedule_hrtimeout_range (hrtimer_wakeup)
0.5% ( 0.5) hald-addon-stor : schedule_hrtimeout_range (hrtimer_wakeup)
0.5% ( 0.5) iwlagn : mod_timer (ieee80211_sta_timer)
0.5% ( 0.5) <kernel core> : __mod_timer (neigh_periodic_timer)
0.4% ( 0.5) gpg-agent : schedule_hrtimeout_range (hrtimer_wakeup)
0.4% ( 0.4) knotify : schedule_hrtimeout_range (hrtimer_wakeup)

In both cases there's no C3, but I think that's because C3 changes to C4
when on battery?

Cheers,
FJP


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