[parted-devel] [PATCH 6/6] libparted: fix optimal IO alignment

Phillip Susi psusi at ubuntu.com
Wed Dec 19 21:55:01 UTC 2012


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On 12/19/2012 3:41 PM, Jim Meyering wrote:
> Ok, that makes sense. Then what do you think about lowering the bar
> from 1MiB to 128KiB? Maybe even 64KiB, I suppose.  Better safe than
> sorry. Just look at how many people are still reporting problems 
> with parted 1.8, so many years later.

Wasn't the problem there just that it did not know about optimal
alignment, not that it was getting incorrect values from the kernel?
The facility was added to the kernel so that tools like parted could
be told the appropriate value to use rather than having to guess, so
I'm inclined to use it.  Why have a minimum?  If the kernel says it
knows this device should use a 48 KiB alignment, who are we to assume
that is wrong?

> I'm pretty sure those tests do actually serve some purpose. Maybe
> Brian (Cc'd) knows for sure? (Brian, this is about the use of
> PED_DEFAULT_ALIGNMENT, aka 1MiB in commit
> c749046a54d983f74f8156c0aea71b0995b9477d)

Did you forget to Cc him?


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