Potential source of interrupt aliasing

Peter Jeremy PeterJeremy at optushome.com.au
Mon Apr 11 04:28:18 PDT 2005


On Mon, 2005-Apr-11 11:39:12 +0200, Wilko Bulte wrote:
>On Mon, Apr 11, 2005 at 12:34:01PM +0300, Danny Braniss wrote..
>> ...
>> > It's a pity that the modern PC is hamstrung by design decisions made
>> > over 25 years ago.
>> 
>> sorry, but couldn't help it :-)
>> 
>> The US Standard railroad gauge (distance between the  rails) is 4
>> feet, 8.5 inches. That's an exceedingly odd number.

Alternative measurements of 1435mm or 4.787nsec are just as odd.

>> Why did the  English people build them like that?
>
>Why would any sane person continue to use inches, feet, stones, yards
>etc etc anyway?

That could be the problem :-).  If the CPU and PCI bus is built using
imperial measurements whilst the northbridge/southbridge is a metric
BGA, the electrons could be getting confused by the changes in units
and are arriving at the wrong interrupt pin. :-) :-)

-- 
Peter Jeremy


More information about the freebsd-current mailing list