Re: nacl and CPU frequency.
On Sat, Sep 22, 2012 at 05:29:45PM +0100, peter green wrote:
> I therefore conclude that if it's not returning elapsed times in true CPU
> cycles it probablly doesn't matter much if the supposed CPU speed and the
> real CPU speed are not exactly the same.
> As such unless someone objects I plan to patch the code to fallback to
> using bogomips as a "psuedo CPU speed" if true CPU speed cannot be
procps has been struggling with this for years, though ita mainly around
the CPU ticks versus real seconds. If you are really bored, have a look
at some old procps bugs where this sort of thing has broken.
We've narrowed it down to a small handful of checks. The real value is
probably unknown for some devices so we just set it to a fixed value.
The point is, trying to guess this sort of stuff will probably give you
the wrong number so a "pseduo CPU speed" is probably as bad as anything
else you can come up with, so find something simple.
Craig Small VK2XLZ http://enc.com.au/ csmall at : enc.com.au
Debian GNU/Linux http://www.debian.org/ csmall at : debian.org
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