How to cache static files under root /var/www/html/images

[Ebayer Ebayer]

Is there a more deterministic way besides fully trusting the MMU? I really
don't think the MMU will execute well on what I'm setting to accomplish.
Some more info:

* I run Linux 2.6.32 (RH's)

* I don't trust /dev/shm as a memory store

* I want the kernel to keep files cached for a pre determined length of
time Xmns

* Don't want to think too hard about how the MMU evicts pages and how that
affects caching exactly

Thanks
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