2.6.32-11-pve x86_x64 and cache memory with Centos 6

[chencho]

I have a proxmox 2.1 with openvz with Centos 6 x64.

Not sure why, my memory goes to the limit ever.

total: 4096 Mb.
used: 3826 Mb.
free: 269 Mb.

It's only goes down when i made a backup.

I have both, host and vz updated.

 

[dietmar]

what is the output of

# free

 

[chencho]

Into Vm

             total       used       free     shared    buffers     cached
Mem:       4194304    2626828    1567476          0          0    2051284
-/+ buffers/cache:     575544    3618760
Swap:      1048576      39464    1009112

Into Host

             total       used       free     shared    buffers     cached
Mem:      16336336   13463096    2873240          0     843832    9529156
-/+ buffers/cache:    3090108   13246228
Swap:     16382968      39464   16343504

Into host, i need to do

echo -n 1 > /proc/sys/vm/drop_caches