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SubjectRe: Scatter-gather list constraints

>> - Is it performance critical?
> For people using wireless USB drives, yes.

But only if there is a lot of 512 byte block IO? The only case I can think
of right now would be XFS log IO and perhaps some O_DIRECT/raw device

Or how did you determine it is critical? Was there some important workload where
most of the requests had this form?

If it's only an relative oddball just copying is fine imho.


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