buffer cache question

[JaniD++]

Hello, list,

I use 4 disk nodes with NBD.
All of my nodes have 2GB ram.

But the buffer cache newer rise over 830MB.

Is there some limit?
Where can i change this limit? (if it is)

Thanks,
Janos

[root@st-0001 root]# free
             total       used       free     shared    buffers     cached
Mem:       2073152     933188    1139964          0     836776      43416
-/+ buffers/cache:      52996    2020156
Swap:            0          0          0
[root@st-0001 root]# cat /proc/meminfo
MemTotal:      2073152 kB
MemFree:       1139012 kB
Buffers:        835928 kB
Cached:          43448 kB
SwapCached:          0 kB
Active:          12872 kB
Inactive:       871424 kB
HighTotal:     1179584 kB
HighFree:      1129764 kB
LowTotal:       893568 kB
LowFree:          9248 kB
SwapTotal:           0 kB
SwapFree:            0 kB
Dirty:               0 kB
Writeback:           0 kB
Mapped:           9104 kB
Slab:            30248 kB
CommitLimit:   1036576 kB
Committed_AS:    15428 kB
PageTables:        408 kB
VmallocTotal:   114680 kB
VmallocUsed:       196 kB
VmallocChunk:   114476 kB
[root@st-0001 root]#

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