problem : quantity of memory available

[Fuhr Guillaume <guillaume.fuhr-chaudier@up.univ-mrs.fr>]

Hi !

I run debian on a dual opteron system with kernel (
kernel 2.6.7-5-amd64-k8-smp ) and 2GB of memory.

I have add 4GB of memory on this computer and when i verify quantity of memory 
available (with "dmesg | grep Memory" for example), the result is  : 
Memory: 5081952k/6291456k available (1684k kernel code, 0k reserved, 987k
 data, 152k init)

So i want to know why there is 1 GB that i can't use :(

Thanks
Guillaume

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