Date: Sun, 23 Oct 2005 12:13:38 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Nate Lawson <nate@root.org> Cc: current@freebsd.org Subject: Re: 1kHz noise from C3 sleep Message-ID: <20051023121338.3e253c97@Magellan.Leidinger.net> In-Reply-To: <4357E137.5090703@root.org> References: <200510172310.j9HNAVPL013057@repoman.freebsd.org> <20051018094402.A29138@grasshopper.cs.duke.edu> <435501B9.4070401@samsco.org> <43553162.5040802@root.org> <20051020141023.0ejwdv4dss48wko0@netchild.homeip.net> <4357E137.5090703@root.org>
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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...
Bye,
Alexander.
--
Loose bits sink chips.
http://www.Leidinger.net Alexander @ Leidinger.net
GPG fingerprint = C518 BC70 E67F 143F BE91 3365 79E2 9C60 B006 3FE7
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