Request for information - timers, hz, interrupts

[Phillip Spring]

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 at freebsd.org
> From: ivoras at 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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