Re: 1kHz noise from C3 sleep

From: Nate Lawson (nate_at_root.org)
Date: 10/20/05

  • Next message: Anish Mistry: "Re: kern/87506 : [PATCH] Fix alias support on vr interfaces" 
    Date: Thu, 20 Oct 2005 11:25:59 -0700
To: Alexander Leidinger <Alexander@Leidinger.net>

    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.

    > If yes: Windows doesn't make such a noise, does this mean it doesn't use C3
    > on this system (your comment suggests that Windows does use a HZ=1000 like
    > behavior)?

    It's possible it doesn't. Windows 2000 and newer uses hz=1000. 

    -- 
Nate
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  • Next message: Anish Mistry: "Re: kern/87506 : [PATCH] Fix alias support on vr interfaces"

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