knfsd and memory usage

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So I have this new file server (2.4.16), and it's memory looks like
Mem: 771952K total, 767492K used, 4460K free, 22016K buffers
Swap: 0K total, 0K used, 0K free, 71848K cached

So cache, buffers, and free memory account for ~100MB.
There are a handful of userspace processes taking ~20MB.

Obviously I expect the kernel to take up some memory, but 650 megs?

Is there I way I can find out where all of that memory went?
If knfsd is hoarding (no other box has this much unaccounted for), is
there a way to tweak it at runtime? Are there 'safe' things to adjust at
compile time?

Thanks
        -- Brian
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