lkml.org 
[lkml]   [2007]   [Apr]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [00/17] Large Blocksize Support V3
    William Lee Irwin III <wli@holomorphy.com> writes:
    >> In memory as on disk, contiguity matters a lot for performance.

    On Thu, Apr 26, 2007 at 12:21:24PM -0600, Eric W. Biederman wrote:
    > Not nearly so much though. In memory you don't have seeks to avoid.
    > On disks avoiding seeks is everything.

    I readily concede that seeks are most costly. Yet memory contiguity
    remains rather influential.

    Witness the fact that I'm now being called upon a second time to
    adjust the order in which mm/page_alloc.c returns pages for the
    sake of implicitly establishing IO contiguity (or otherwise
    determining why things are coming out backward now).


    -- wli
    -
    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: 2007-04-27 02:35    [W:0.021 / U:89.872 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site