Server always low on physical memory

My server is always running around 5 free mb of physical memory out of 512. This is even happening when there are no users connected.

Immediately after restarting the server the free memory was at like 400mb, but then it begins to lessen and lessen until it settles around 5mb.

I tried to stop different services to see if one of those were the problem, and I looked at the 'top', but I can't seem to find a process that is using so much memory, though I did find a something extremely strange running called mdrecoveryd.

Look at the attached image to understand what I'm talking about. You can also see how low the memory is in that image.

Does any one have any idea what this is all about?

The server is a P4 2.4, 512mb, Red Hat 9.

Thanks for any help!

 

 

 

 

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