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SubjectRe: absurdly high "optimal_io_size" on Seagate SAS disk
> From: Chris Friesen <chris.friesen@windriver.com>

> Also, I think it's wrong for filesystems and userspace to use it for
> alignment. In E.4 and E.5 in the "sbc3r25.pdf" doc, it looks like they
> use the optimal granularity field for alignment, not the optimal
> transfer length.

Everything you say suggests that "optimal transfer length" means
"there is a penalty for doing transfers *larger* than this", but
people have been treating it as "there is a penalty for doing
transfers *smaller* than this". But the latter is the "optimal
transfer length granularity".

Dale


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