Re: 2.6.24 still causes 1000Hz wakeups on x86_64

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On 15/03/2008, Mike Cronenworth <mike@xxxxxxxxxx> wrote:
> What's the deal? The tickless kernel shouldn't be causing wakeups at
>  idle, correct?
>
>  On a Pentium 4 3ghz HT machine, 2.6.24 shows very little wakeups
>  occuring, but on my Core 2 Duo 2.1ghz machine I'm getting over 1000
>  wakeups and it's keeping one core fully awake.
>
>  powertop output:
>  Top causes for wakeups:
>   88.4% (1000.0)          events/0 : run_workqueue (ir_timer)
>    5.5% ( 62.0)       <interrupt> : uhci_hcd:usb3, ahci, nvidia
>    1.2% ( 13.2)       <interrupt> : uhci_hcd:usb4, libata
>    1.1% ( 12.0)   <kernel module> : usb_hcd_poll_rh_status (rh_timer_func)
>    0.9% ( 10.0)     <kernel core> : ehci_irq (ehci_watchdog)
>    0.5% (  5.2)   thunderbird-bin : futex_wait (hrtimer_wakeup)
>
>  On my P4 machine, "events/0 : run_workqueue" is further down on the list
>  and isn't causing major wakeups.
>
>  Both test machines are using Fedora 8. Latest updates. XFCE desktop. No
>  process or applications are running (besides Thunderbird, obviously).
>  Google searching resulted in nothing positive. Am I the only one?
>

On my intel core 2 duo laptop, I don't see the problem you report:

Wakeups-from-idle per second : 177.2    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  35.2% ( 58.5)      npviewer.bin : schedule_timeout (process_timeout)
  26.9% ( 44.6)      <kernel IPI> : Rescheduling interrupts
   7.8% ( 13.0)       <interrupt> : iwl3945
   5.2% (  8.6)       <interrupt> : libata
   3.8% (  6.3)       file-roller : schedule_timeout (process_timeout)
   2.8% (  4.7)                 X : do_setitimer (it_real_fn)


But you're probably seeing a legitimate bug (perhaps incorrect boot
time selection of clock source or something). It's probably worth
reporting this as a bug with as much detail about your hardware as you
can (lspci -vv etc).

Jonathan.

>  Regards,
>  Michael
>
>
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