[ltp] Re: very high number of wakeups (and power consumption) on T60p

[Ondrej Balaz]

On 2008-02-28, Peter F. Patel-Schneider <pfps@research.bell-labs.com> wrote:
> Has anyone run into problems with tens of thousands of wakeups that are
> unexplained in powertop?  This does appear to be real as battery drain
> does jump up about 30-40%.
>
> Here is typical powertop output.  The machine was just about idle when
> this measurement was taken.
>
>
>     PowerTOP version 1.9       (C) 2007 Intel Corporation
>
> Cn                Avg residency       P-states (frequencies)
> C0 (cpu running)        (30.1%)         2.17 Ghz     5.1%
> C1                0.0ms ( 0.0%)         1.67 Ghz     0.0%
> C2                0.0ms (65.3%)         1333 Mhz     0.0%
> C3                0.3ms ( 4.6%)         1000 Mhz    94.9%
>
>
> Wakeups-from-idle per second : 46243.6  interval: 10.0s
> Power usage (ACPI estimate): 26.5W (0.8 hours) (long term: 28.0W,/0.8h)
>
> Top causes for wakeups:
>   12.1% (  1.8)       <interrupt> : extra timer interrupt

check your /proc/interrupts if NMI: line is 0. If not, remove nmi_watchdog=1
from kernel boot arguments.

>    8.7% (  1.3)    wpa_supplicant : schedule_timeout (process_timeout)
>    8.1% (  1.2)                 X : do_setitimer (it_real_fn)
>    7.4% (  1.1)       <interrupt> : ahci
>    6.7% (  1.0)       firefox-bin : futex_wait (hrtimer_wakeup)
>    6.7% (  1.0)              tail : do_nanosleep (hrtimer_wakeup)
>    6.7% (  1.0)   multiload-apple : schedule_timeout (process_timeout)
>    6.7% (  1.0)   setroubleshootd : schedule_timeout (process_timeout)
>    6.0% (  0.9)        atieventsd : schedule_timeout (process_timeout)
>    3.4% (  0.5)       <interrupt> : eth0
>    3.4% (  0.5)    NetworkManager : e1000_intr_msi (e1000_watchdog)
>    3.4% (  0.5)          gconfd-2 : schedule_timeout (process_timeout)
>    2.7% (  0.4)   gnome-power-man : schedule_timeout (process_timeout)
>    2.0% (  0.3)   <kernel module> : neigh_table_init_no_netlink (neigh_periodic_
>    2.0% (  0.3)     <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer) 
>
>
>
> Peter F. Patel-Schneider
>


-- 
Ondrej `blami' Balaz