lkml.org 
[lkml]   [2003]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Transparent compression in the FS
    > The idea of this sort of block level hashing to allow
    > sharing of identical blocks seems attractive but i wouldn't
    > trust any design that did not accept as given that there
    > would be false positives. This means that a write would
    > have to not only hash the block but then if there is a
    > collision do a compare of the raw data. Then you have to
    > add the overhead of having lists of blocks that match a hash
    > value and reference counts for each block itself. Further,

    Then write every data block will need to dirty at least 2 blocks.
    And it also need to read back the original block if hash exist.
    There must be some performance hit.

    Chris
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:58    [W:0.065 / U:0.432 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site