Messages in this thread | | | Date | Mon, 11 Jan 2010 08:52:56 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [ANNOUNCE] util-linux-ng v2.17 (stable) |
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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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