about the performance comparsion of 6.1 vs 5.3 on amd64

I did some test about io performance of bsd6.1 and bsd5.3 on amd64 machine , and i didn't see any obvious performance's improvement .
Is there anybody know how about the performance improvement of bsd6.1 when comparing to bsd5.3 on amd64 machine, and is there any tools that can let me see the improvement.

Best Regards
Yandy

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