Re: Scatter-gather list constraints

[Andi Kleen]

> On the fs side, just setting a hw block size of 1k should fix the
> problem, since that'd be your minimum transfer size AND alignment there
> even for O_DIRECT IO.

XFS used to force 512 byte IOs for its log IO. Not sure
that was ever fixed. If it was fixed it likely required a disk format
change (I think s390 ran into a problem like this)

-Andi

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