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.
If you are getting out of memory errors, you can tweek the amount of memory that they system keeps in reserve using "vm.min_free_kbytes" in /etc/sysctl.conf
I don't find vm.min_free_byes in sysctl.conf. It isn't mentioned in the man pages.
Thanks. John
http://lists.centos.org/pipermail/centos/2006-December/030761.html
This is a good article that discusses how to adjust this too:
http://www.dba-oracle.com/t_tuning_linux_kernel_2_6_oracle.htm
As far as what version of CentOS you have ... you can figure that out with:
cat /etc/redhat-release
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