Re: Mentor for a GSoC application wanted (Online ext2/3 filesystem checker)

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Andi Kleen wrote:
> [LVM] always disables barriers if you don't apply a so far unmerged
> patch that enables them in some special circumstances (only single
> backing device)

(I continue to be surprised at the un-safety of Linux fsync)

> Not having barriers sometimes makes your workloads faster (and less
> safe) and in other cases slower.

I'm curious, how does it make them slower?  Merely not issuing barrier
calls seems like it will always be the same speed or faster.

Thanks,
-- Jamie
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