Re: [ANNOUNCE] util-linux-ng v2.17 (stable)

[H. Peter Anvin]

On 01/11/2010 06:05 AM, Pavel Machek wrote:
> On Fri 2010-01-08 13:43:47, H. Peter Anvin wrote:
> > On 01/08/2010 01:33 AM, Karel Zak wrote:
> > > fdisk:
> > >     - the fdisk command aligns newly created partitions to minimum_io_size
> > >       boundary ("minimum_io_size" is physical sector size or stripe chunk
> > >       size on RAIDs).
> > >
> > >     - the fdisk command supports disks with alignment_offset now.
> >
> > I think we should align, by default, much more aggressively than that --
> > because frequently we just don't know what the real physical alignment
> > is (think of flash media, which uses large erase blocks underneath.)
>
> Flash has special mapping layer, and does not care (SD/MMC), or is a
> raw nand and can't be used as block device (smartmedia).

Uhm, that's just plain wrong.

It doesn't matter if there is a "special mapping layer" -- if you're 
crossing multiple erase blocks you're still having more churn in your 
flash translation layer, with more wear on the device, and lower 
performance than if you didn't.

	-hpa
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