Messages in this thread | | | Date | Mon, 25 Jul 2005 22:38:25 +0200 | From | Jesper Juhl <> | Subject | Re: Problem with Asus P4C800-DX and P4 -Northwood- |
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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> Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html Plain text mails only, please http://www.expita.com/nomime.html - 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/
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