I was also interested in that. There doesn't seem to be any direct posting of perf. numbers, but it does hint at it indirectly (from http://lkml.org/lkml/2007/5/9/251):
"""Performance wise, it's meant to help higher end hardware that need 2-4mb (or bigger) commands to get good performance. That also includes things like tapes that have big block sizes, getting a command of the right size there is the difference between good and abysmal performance."""
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