Date: Sat, 12 Dec 2009 10:44:04 +0100 From: Phillip Spring <gatinhodosseussonhos@hotmail.com> To: <ivoras@freebsd.org>, <freebsd-hackers@freebsd.org> Subject: RE: Request for information - timers, hz, interrupts Message-ID: <SNT102-W310DA3B1D3A4AB7CC1BFFBD38B0@phx.gbl> In-Reply-To: <hfb7ne$mi$1@ger.gmane.org> References: <hfb7ne$mi$1@ger.gmane.org>
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fact:
I had to clean up a motherboard to boot Suse 10.2 kernel.
I think that dust and dead insects are for Windows 2003 only.
dog -- now with the right sender name :)
> To: freebsd-hackers@freebsd.org
> From: ivoras@freebsd.org
> Date: Fri, 4 Dec 2009 15:52:39 +0100
> Subject: Request for information - timers, hz, interrupts
>
> For a long time, at least in the 6-stable timeframe, I was used to
> seeing timer interrupts going at the frequency of 2*HZ, e.g. this is
> from 6.4-RELEASE:
>
> kern.clockrate: { hz = 250, tick = 4000, profhz = 166, stathz = 33 }
> debug.psm.hz: 20
>
> cpu0: timer 6789885563 499
> cpu2: timer 6789885538 499
> cpu1: timer 6789885538 499
> cpu3: timer 6789885537 499
>
> Then sometime in 7.x this changed to 4*HZ, which continues in 8.x, e.g.
> from 7.2-RELEASE:
>
> kern.clockrate: { hz = 250, tick = 4000, profhz = 1000, stathz = 142 }
> kern.hz: 250
>
> cpu0: timer 1368329715 988
> cpu1: timer 1368324640 988
> cpu2: timer 1367642854 988
> cpu3: timer 1367642874 988
>
> I'm not very worried about it (though maybe laptop users might be
> because of potential power drainage) but would like to know the
> explanation behind it.
>
> Presumably it has something to do with profhz but what and why? There
> isn't an obvious correlation between profhz frequency in 6.x and HZ and
> in 7.x. and HZ.
>
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