Redhat: Kernel upgrades

Recently I upgraded my Redhat 7. 1 kernel from 2.4.2 to 2.4.9, then changed lilo to boot form new kernel. My problem is, my memory down form 1 GB to 900+ MB, although the old kernel work fine with 1.8GB swap. How can I resolve this.

ps: sorry for my english

 

 

 

 

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