Brian, On Friday 06 March 2009, Brian J. Murrell wrote: > I have a WinXP guest on a Linux host and as I have suspected for a long > time, the throughput of the disk in WinXP is much slower than native > disk performance. To the tune of only 25%. > > The WinXP installation is on a real partition and when I boot that WinXP > natively on the hardware I get about 20MB/s throughput. > > If I boot Linux, Linux sees 20MB/s on that partition as well, however > that same WinXP run in a vritualbox configured to use the partition raw, > only sees about 5MB/s. > > I guess I should add that I'm using VB 2.1.4 and have guest extensions > installed.
Please could you be a bit more specific: * I assume that you are running Windows XP / 32, is that right? * Do you have VT-x / AMD-V enabled for that VM or not? * Which virtual hard disk controller are you using, IDE or SATA? * Check the disk settings in the guest: Does the guest drive the hard disk in DMA mode or PIO mode? Check the session information dialog for this as well -- PIO and DMA accesses are shown there. * Which benchmark did you use for measuring the throughput? Kind regards, Frank -- Dr.-Ing. Frank Mehnert Sun Microsystems http://www.sun.com/
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