lkml.org 
[lkml]   [2002]   [Jul]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [Announce] device-mapper beta3 (fast snapshots)
    From
    Date
    On Tue, 2002-07-16 at 12:31, Joe Thornber wrote:

    > > Joe, are you absolutely sure these tests had the disk cache disabled? That's
    > > the only hardware thing I can think of that would make a difference.
    >
    > Absolutely sure. Those figures were for a pair of PVs that were
    > sharing an IDE cable so I can certainly get things moving faster.

    Some IDE drives ignore commands to turn off the write back cache, or
    turn it back on when load gets high.

    Try iozone -s 50M -i 0 -o with writeback on and off. If you get the
    same answer the benchmarks are suspect....

    -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 13:27    [W:0.040 / U:0.320 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site