cpu-timer rate

[Greg 'groggy' Lehey]

On Friday,  2 December 2005 at 14:32:58 +0100, kama wrote:
>
> Hi,
>
> I am just wondering why the cpu-timer is doubled from what I set in
> kern.hz?
>
> # vmstat -i
> ...
> cpu0: timer                     14314031       1999
>
> # sysctl -a | grep hz
> kern.clockrate: { hz = 1000, tick = 1000, profhz = 666, stathz = 133 }

Interesting question.  So far I haven't seen an answer that comes
close to explaining it.  My guess is that it's because of the specific
timer you're using; which is it?  Is there anything else of interest
in your setup?

FWIW, I get (without ACPI) on two different machines essentially the
same:

  $ vmstat -i
  interrupt                          total       rate
  irq0: clk                       55250411       1000
  irq1: atkbd0                       47365          0
  irq5: ohci1                        97516          1
  irq8: rtc                        7069645        127
  irq10: ehci0                           1          0
  irq11: nve0 xl0+                 1022991         18
  irq14: ata0                       425652          7
  irq15: ata1                         4777          0
  Total                           63918358       1157
  $ sysctl -a | grep hz
  kern.clockrate: { hz = 1000, tick = 1000, profhz = 1024, stathz = 128 }
  debug.psm.hz: 20

Greg
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