On Sun, 20 May 2007, Nick Piggin wrote:

quoted text
> I _am_ considering the average case, and I consider the aligned structure
> is likely to win on average :) I just don't have numbers for it yet.

I'd be glad too if you could get some numbers. I did some benchmarking a 
few weeks ago on x86_64 and I found only a very minimal performance drop 
if the calculation was simplified. 

Note also that a smaller structure means that more page structs can be 
covered by a certain amount of cachelines. Doing the alignment may cause 
more cacheline misses.

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