Messages in this thread | | | Date | Fri, 7 Nov 2014 10:18:46 -0500 | From | (Dale R. Worley) | Subject | Re: absurdly high "optimal_io_size" on Seagate SAS disk |
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> 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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