lkml.org 
[lkml]   [2010]   [Jan]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [ANNOUNCE] util-linux-ng v2.17 (stable)
    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


    \
     
     \ /
      Last update: 2010-01-11 17:55    [W:2.801 / U:0.032 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site