Memory usage

[Alexey Fadyushin]

The Linux kernel usually uses memory which is not in use by user
processes
as the disk cache. Therefore, usually there is little memory which is
comletely 'free' - as memory pages are freed by processes those pages
are used
for disk cache. When some process needs memory the kernel will reduce
the disk cache size ang give to the procces memory which was occipied by
cache.

Alexey Fadyushin.
Brainbench MVP for Linux.
http://www.brainbench.com

Roger Harrell wrote:
> 
> I've just put my RH 9 box into production. I've been working on tuning
> it to optimize performance, but am a little confused. When I do ps -aux
> and total memory usage I get about 40% usage. When I do top, or pull up
> the system monitor it shows 495 MB in use (the box has 512MB). Where is
> all the extra memory being used?
> 
> Thanks,
> --
> Roger Harrell
> 
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