386 Motherboards

Peter Brouwer pb at idca.tds.PHILIPS.nl
Fri May 4 16:45:21 AEST 1990


 In article <MAT.90May3084057 at zeus.megargon.arizona.edu> mat at zeus.opt-sci.arizona.edu (Mat Watson) writes:
>I've gotten some responses to my posting, and
>I STAND CORRECTED!  Thanks for setting me straight.
>I wrote:
>>   Since *nix swaps entire jobs ( which I assume are larger than the
>>   cache ), doesn't that screw up the hit rate?
>Not True.  I'm told that Unix seldom swaps out entire jobs,
>so the cache actually ends up working pretty well on a single
>user system.
>

In a paging system pages are loaded on demand and if memory gets thight
pages are swapped.
If a page is swapped out or in it is copied through a few buffers in memory
in the kernel code. Like from the memory from the disk controller into a
kernel buffer and from that to the location in memory where it will be used.
Does this not trash the cache?



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