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Free / Cached / Available memory on Linux

My Redhat server shows the following:

free -m 
============= 
             total       used       free     shared    buffers     cached 
Mem:          8113       8078        35          0        171       6491   
-/+ buffers/cache:       1415       6698   
Swap:         8189         59       8130 

Is 35 mega of free memory considered critical on a production server ?

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migrated from stackoverflow.com Jun 30 '12 at 16:31

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marked as duplicate by Lucas Kauffman, mailq, mgorven, mulaz, Magellan Oct 17 '12 at 0:31

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2 Answers

No! you got 6698 MB as file-/buffercache used, this is good! if a program/service needs more ram the file cache ("cached") is getting reduced and the program get the freed RAM. a good explanation why and how it works here: http://www.linuxatemyram.com/

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thanks for your help –  bob Jun 29 '12 at 8:03
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Unused memory is utilized for disk caching.

Linux rarely shows a high free in number in the Mem column, and hence that metric is a bit misleading in determining RAM constraints.

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