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  3. December 2001

Re: Trivia: Processor MHz

From: Hall, Philip <phall@spss.com>

> > The first two 4-byte words shown contain the number of clock
> > ticks when this process last run.
>
> What are those values actually representing ? and how does it differ from
> the value returned by mattod
>
> http://publib.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/QBJADR00/1.78.5
>

The decrementer register interrupt response (at 8000000000 000900)
reads a cycle counter register which simply counts machine cycles
since the machine was powered on. The cycle count is used by the
lowest layer of SLIC in calculations that has to do with elapsed time.

Various cycle counts are stored in the TDE (Task Dispatching Element).

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