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windows memory management has never been very good... the requirements for mem are extremely high for xp. that's one of the major complaints usually lodged against ms products - the amount of memory required. linux, by contrast, isn't the best at handling memory (there have been recent debates among linux developers regarding memory management), but it's still much better than windows.
generally, most linux systems require much less memory than xp to operate well. it seems that whenever i see a benchmark of windows versus linux, it's a poorly tuned or out-of-date linux against a souped-up ms box, and windows still barely wins. the latest linux kernels, or even older distribution kernels will pretty much beat-up xp.
it's also possible that the benchmarker just didn't know what they were talking about. linux uses up 100% of the memory at all times - it's just the way the o/s operates, and allocates to programs as needed. that makes virtual memory easier to use, and actually speeds up the memory usage, but someone who doesn't know how it works might say that it uses too much memory.
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