13 Nov
2011
13 Nov
'11
4:11 p.m.
On 11/13/2011 05:32 AM, John J. Boyer wrote:
On Sat, Nov 12, 2011 at 09:45:04AM -0600, Johnny Hughes wrote:
Linux puts things in cache using extra (unused) memory. It is absolutely normal to have "Free Memory" go down to a fairly small level and have Buffers and Cache grow.
Why does Linux do this? It seems odd to me.
Because it means that once you've accessed something once, accessing it a second time is orders of magnitude faster. Memory that is not being used at all is a waste of resources. It dramatically improves the performance of a system to use otherwise unused memory for caching and buffers.
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Benjamin Franz