> AFAIK this will always show high memory usage as linux tries to
> maximize memory usage and optimise disk buffers for improving
> performance. More user memory space getting used would mean lesser
> allocation to disk buffering.
Yes, a well running system usually have 5%-10% of 'free' memory and
'used' should be around or lower than (2 x 'cached').
If you have more 'free' memory, this memory is not used, you have too
much memory (this is not a problem).
If you have:
- A low value for 'cached' ('used' >= 4x 'cached')
- Swap activity (use something like 'sar -p 15 1000')
you do not have enough RAM.
(Those value are not true for a dedicated server that run a very small
number of different program like a database only server).
> And again AFAIK 7gb of swap is not going to be addressed, maximum 2gb
> swap is usable.
Not at all, Linux is able to use more than 2GB of swap. There is a
limit of 2GB for every swap partition on i386 (I don't know for
amd64), but you can and you should balance swap on every (fast) disk
you have to increase bandwidth.
If the system is reporting 7GB of swap, it can use it.
--
Sébastien Koechlin
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