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?
--
Peter Brouwer, # Philips Information Systems,
NET : pb at idca.tds.philips.nl # Department SSP-P9000 Building V2,
UUCP : ....!mcsun!philapd!pb # P.O.Box 245, 7300AE Apeldoorn, The Netherlands.
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