Re: cp file /dev/zero <-> cache [was Re: increasing page size]

[Rik van Riel <H.H.vanRiel@phys.uu.nl>]

On Thu, 9 Jul 1998, Stephen C. Tweedie wrote:

> There's a fundamentally nice property about the multi-level cache
> which we _cannot_ easily emulate with page aging, and that is the
> ability to avoid aging any hot pages at all while we are just
> consuming cold pages.  For example, a large "find|xargs grep" can be
> satisfied without staling any of the existing hot cached pages.

Thinking over this design, I wonder how many levels
we'll need for normal operation, and how many pages
are allowed in each level.

I'd think we'll want 4 levels, with each 'lower'
level having 30% to 70% more pages than the level
above. This should be enough to cater to the needs
of both rc5des-like programs and multi-megabyte
tiled image processing.

Then again, I could be completely wrong :) Anyone?

Rik.
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