Re: i386: Selectable Frequency of the Timer Interrupt

[Jan Engelhardt]

Hi,

>> >     HZ   ticks/jiffie  1 second      error (ppm)
>> > ---------------------------------------------------
>> >    100      11932      1.000015238      15.2

I was not quite able to reproduce these values, probably because I got the
math wrong. I used:
  $oneSecond = $ticksJiffie * $HZ / 1193182
which yields 11932*100/1193182 = 1.00001508571198693912, !=1.000015238
Math corrections welcome.

Anyway, I've done some graphs. Intersting that the smaller the HZ, the less
error (seen on a whole, esp. view_1k and view_8k.png) we get. 20Hz seems to
be the 0.0 case, and 18Hz is not bad either. IIRC, DOS used 18HZ ;)
http://jengelh.hopto.org/tick/




Jan Engelhardt
-- 
| Alphagate Systems, http://alphagate.hopto.org/

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