Re: 1kHz noise from C3 sleep

From: Nate Lawson (nate_at_root.org)
Date: 10/23/05

  • Next message: Jisakiel: "Small typo in /usr/share/examples/make.conf" 
    Date: Sun, 23 Oct 2005 11:03:52 -0700
To: Alexander Leidinger <Alexander@Leidinger.net>

    Alexander Leidinger wrote:
    > On Thu, 20 Oct 2005 11:25:59 -0700
    > Nate Lawson <nate@root.org> wrote:
    >
    >
    >>Alexander Leidinger wrote:
    >>
    >>>Nate Lawson <nate@root.org> wrote:
    >>>
    >>>[Moving to -current]
    >>>
    >>>
    >>>>>I wonder if moving to HZ=1000 on amd64 and i386 was really all that good
    >>>>>of an idea. Having preemption in the kernel means that ithreads can run
    >>>>>right away instead of having to wait for a tick, and various fixes to
    >>>>>4BSD in the past year have eliminated bugs that would make the CPU wait
    >>>>>for up to a tick to schedule a thread. So all we're getting now is a
    >>>>>10x increase in scheduler overhead, including reading the timecounters.
    >>>>
    >>>>
    >>>>I use hz=100 on my systems due to the 1 khz noise from C3 sleep.
    >>>>Windows has the same problem.
    >>>
    >>>
    >>>My laptop makes noises when being (more or less) idle (I think I enabled
    >>>C3...). Does this mean I should try to change HZ?
    >>
    >>Sure, you can do it from a tunable (kern.hz I think), you don't have to
    >>recompile.
    >
    >
    > No, a HZ of 100 doesn't work, the laptop still makes noises. And it
    > only has C2, no C3...

    Change to C1 (which is just HLT). If it still makes noise, it's not
    your C2 or C3 sleep. 

    -- 
Nate
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
  • Next message: Jisakiel: "Small typo in /usr/share/examples/make.conf"

    Relevant Pages

    • Re: 1kHz noise from C3 sleep
      ... Alexander Leidinger wrote: ... > It's the C2 sleep. ... Or earplugs. ... To unsubscribe, ...
      (freebsd-current)
    • Re: White Noise Machine?
      ... I have found I tend to hear every creak, every step outside in the hallway, etc., at night and it occurred to me that a white noise machine might help block those little noises. ... That's assuming you can actually SLEEP with foreign objects in your ears! ... But you can sleep with the sound from the machine added to other disturbing noise ?? ... I find those sounds more soothing than voices in neighboring rooms. ...
      (rec.travel.europe)
    • Re: Alpha male II.
      ... her car is making grinding ... noises. ... Good night's sleep and she'll be back on my case. ...
      (misc.writing)
    • Re: Alpha male II.
      ... her car is making grinding ... noises. ... Good night's sleep and she'll be back on my case. ...
      (misc.writing)
    • Re: Alpha male II.
      ... her car is making grinding ... noises. ... Good night's sleep and she'll be back on my case. ...
      (misc.writing)