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RPI model B eats memory?

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Hi all; I use an headless rpi with debian wheezy. I can't understand why 
the available memory decreases, as stated by top:


Boot, start tmux or screen:

top - 10:18:10 up 15 min,  1 user,  load average: 0.07, 0.04, 0.07
Tasks:  82 total,   1 running,  81 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.3 us,  1.3 sy,  0.0 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si, 
KiB Mem:    494572 total,    75496 used,   419076 free,    12872 buffers
KiB Swap:   102396 total,        0 used,   102396 free,    35484 cached



After starting tmux sessions (mail, web, torrent, shell)

top - 10:20:46 up 18 min,  1 user,  load average: 0.20, 0.12, 0.10
Tasks:  96 total,   1 running,  95 sleeping,   0 stopped,   0 zombie
%Cpu(s):  6.7 us,  1.7 sy,  0.0 ni, 89.9 id,  0.0 wa,  0.0 hi,  1.7 si, 
KiB Mem:    494572 total,   127240 used,   367332 free,    16248 buffers
KiB Swap:   102396 total,        0 used,   102396 free,    52616 cached



After some hours (normal run)

top - 09:51:37 up 11:26,  1 user,  load average: 0.05, 0.04, 0.05
Tasks:  96 total,   1 running,  95 sleeping,   0 stopped,   0 zombie
%Cpu(s):  4.3 us,  1.7 sy,  0.0 ni, 94.1 id,  0.0 wa,  0.0 hi,  0.0 si, 
KiB Mem:    494572 total,   478880 used,    15692 free,    74304 buffers
KiB Swap:   102396 total,        0 used,   102396 free,   326248 cached

As you can see the free memory decreases. Any idea? Is it a normal 
behaviour?

Thank a lot,
--
Giorgio

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RPI model B eats memory? Genge' <v.moscarda@gmail.com> - 2015-09-23 10:36 +0200
  Re: RPI model B eats memory? Rob <nomail@example.com> - 2015-09-23 09:12 +0000
  Re: RPI model B eats memory? Dom <domafp@blueyonder.co.uk> - 2015-09-23 10:33 +0100

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