Re: packing structures and numbers

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Avi Kivity wrote:
> I've been reading btrfs's on-disk format, and two things caught my eye
> 
> - attribute((packed)) structures everywhere, often with misaligned
> fields.  This conserves space, but can be harmful to in-memory
> performance on some archs.

How harmful?  Do you have any profiles that can even pick this out of
the noise?

- z
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