[lkml]   [2002]   [Mar]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] 2.4.x write barriers (updated for ext3)
    On Sun, Mar 03, 2002 at 10:34:07PM -0500, Chris Mason wrote:
    > 3) Some drives may not be very smart about ordered tags. We need
    > to figure out which is faster, using the ordered tag or using a
    > simple cache flush (when writeback is on). The good news about
    > the cache flush is that it doesn't require major surgery in the
    > scsi error handlers.

    Isn't that a userspace thing? I.e. use ordered tags in the best
    way possible for drives that _are_ smart about ordered tags.
    Let the admin change that with a hdparm-like utility
    if testing (or specs) confirms that this particular
    drive takes a performance hit.

    I thing the days of putting up with any stupid hw is
    slowly going away. Linux is a serious server os these
    days, and disk makers will be smart about ordered tags
    if some server os do benefit from it. It won't
    really cost them much either.

    Old hw is another story of course - some sort of
    fallback might be useful for that. But probably
    not for next year's drives. :-)

    Helge Hafting
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:24    [W:0.021 / U:110.184 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site