Memory needed for hibernation too much

[Jacky Lam <lamshuyin@xxxxxxxxx>]

Hi all,

    I try the hibernation feature with my MIPS box which has 128MB RAM. 
After boot up, it remains to have 110MB something. Then I mount ramfs on 
a directory, create a file 100MB from /dev/urandom and enter 
hibernation. The process failed because of no memory. Then, I continue 
to cut the data file size and not success until 20MB.

    I want to make sure if it is an expected behavior or I am doing 
some wrong?

    Thanks.

BR,
Jacky