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    SubjectRe: Problem with Asus P4C800-DX and P4 -Northwood-
    On 7/25/05, Erik Mouw <erik@harddisk-recovery.com> wrote:
    > On Mon, Jul 25, 2005 at 09:51:49PM +0200, Andreas Baer wrote:
    > >
    > > Willy Tarreau wrote:
    > > >On Mon, Jul 25, 2005 at 03:10:08PM +0200, Andreas Baer wrote:
    > > >>Here I have
    > > >>
    > > >> /dev/hda: 26.91 MB/sec
    > > >> /dev/hda1: 26.90 MB/sec (Windows FAT32)
    > > >> /dev/hda7: 17.89 MB/sec (Linux EXT3)
    > > >>
    > > >>Could you give me a reason how this is possible?
    > > >
    > > >
    > > >a reason for what ? the fact that the notebook performs faster than the
    > > >desktop while slower on I/O ?
    > >
    > > No, a reason why the partition with Linux (ReiserFS or Ext3) is always
    > > slower
    > > than the Windows partition?
    >
    > Easy: Drives don't have the same speed on all tracks. The platters are
    > built-up from zones with different recording densities: zones near the
    > center of the platters have a lower recording density and hence a lower
    > datarate (less bits/second pass under the head). Zones at the outer
    > diameter have a higher recording density and a higher datarate.
    >
    It's even more complex than that as far as I know, you also have the
    issue of seek times - tracks near the middle of the platter will be
    nearer the head more often (on average) then tracks at the edge.

    For people who like visuals, IBM has a nice little picture in their
    AIX performance tuning guide :
    http://publib.boulder.ibm.com/infocenter/pseries/index.jsp?topic=/com.ibm.aix.doc/aixbman/prftungd/diskperf2.htm


    --
    Jesper Juhl <jesper.juhl@gmail.com>
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    Plain text mails only, please http://www.expita.com/nomime.html
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