Re: 1kHz noise from C3 sleep
From: Alexander Leidinger (Alexander_at_Leidinger.net)
Date: Sun, 23 Oct 2005 12:13:38 +0200 To: Nate Lawson <email@example.com>
On Thu, 20 Oct 2005 11:25:59 -0700
Nate Lawson <firstname.lastname@example.org> wrote:
> Alexander Leidinger wrote:
> > Nate Lawson <email@example.com> 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
No, a HZ of 100 doesn't work, the laptop still makes noises. And it
only has C2, no C3...
-- Loose bits sink chips. http://www.Leidinger.net Alexander @ Leidinger.net GPG fingerprint = C518 BC70 E67F 143F BE91 3365 79E2 9C60 B006 3FE7 _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "email@example.com"