lkml.org 
[lkml]   [2002]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Linux 2.4.18-pre9-ac1
    On Tue, Feb 12 2002, Alan Cox wrote:
    > > > > I want to find out why it was done first and then test it. Leaving it out
    > > > > will ensure it bugs me until I test it
    > > >
    > > > If you leave it out, you surely want to make sure that the other request
    > > > init and re-init paths agree on the clustering for MO devices. Because
    > > > they don't.
    >
    > No - I want to run a test set with an M/O drive before and after the change
    > and see what it shows in real life. I suspect nothing much.

    That completely ignores that there is a _bug_ there currently. There was
    a reason I removed disabled clustering, you know... 2.4 before the
    change oopses, 2.4.18-preX (forget when Marcelo took the patch) has it
    fixed.

    > > Now, disabling request merging for MO devices might make a whole lot
    > > more sense. That might be worth while trying, and I'd be happy to give
    > > you a patch to try that out instead.
    >
    > I don't think that should be required actually. The killer on M/O disks
    > is seek time, and to an extent rotational latency (its 3 trips round a
    > cheaper M/O disk to rewrite a sector). If anything clustering writes to
    > the same track should be a big win.

    You are probably right. Can't make pigs fly :-)

    --
    Jens Axboe

    -
    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 13:24    [W:0.023 / U:32.916 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site