Disk Performance Better in Fusion than Running Natively

Discussion in 'Mac Pro' started by Infrared, Jul 2, 2008.

  1. Infrared macrumors 68000

    Infrared

    Joined:
    Mar 28, 2007
    #1
    According to Vista's disk performance ratings:

    Native: 5.4
    Fusion: 5.9

    Erm.. ?
     
  2. ZeelessOne macrumors member

    Joined:
    Jul 1, 2008
    #2
    Is Fusion running Vista off your Boot Camp partition or is it strictly a virtual machine?
     
  3. Infrared thread starter macrumors 68000

    Infrared

    Joined:
    Mar 28, 2007
    #3
    Strictly in a VM. The native install is on a disk of its own,
    which happens to be the same kind of drive the VM lives
    on.
     
  4. Gonk42 macrumors 6502

    Joined:
    Jan 16, 2008
    Location:
    near Cambridge
    #4
    Maybe Vista uses software timing of somesort to get the ratings (rather
    than real CPU ticks or the real time clock) and the fact that it is running
    in a VM means its clock has slowed so that the disk seems to be relatively
    faster.

    Just an idea based on pure speculation!
     
  5. Infrared thread starter macrumors 68000

    Infrared

    Joined:
    Mar 28, 2007
    #5
    Could it be Apple hobbling Boot Camp performance again?

    http://forums.macrumors.com/showthread.php?t=223679

    I don't think it's quite that bad now. Still, I suspect that the
    same hardware with a real PC BIOS would run Windows faster.
     
  6. tobyg macrumors 6502a

    Joined:
    Aug 31, 2004
    #6
    Wow. Thanks for linking to an ancient thread of mine! That was before Apple even had bootcamp. The world was different then.

    I believe the answer is something more simple such as the caching that VMware does with its simulated hard drive that it presents to the underlying virtualized OS.
     
  7. CanadaRAM macrumors G5

    CanadaRAM

    Joined:
    Oct 11, 2004
    Location:
    On the Left Coast - Victoria BC Canada
    #7
    It's more likely the measuring method is unreliable, rather than the drive changes performance.
     
  8. Infrared thread starter macrumors 68000

    Infrared

    Joined:
    Mar 28, 2007
    #8
    Yes, could be that!

    One thing I noticed: the disk drives in Windows make a distinct and
    different sound compared to running under OS X. Presumably that
    has something to do with the different file structure, layout and
    way it is accessed (hmm.. that sounds suspiciously like stating the
    very obvious :) )
     
  9. Infrared thread starter macrumors 68000

    Infrared

    Joined:
    Mar 28, 2007
    #9
    Yes it could be that too!

    Thanks.
     

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