Re: [Xen-users] performance discrepancy between guest on partition and guest on file image

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Jun 03, 2008 at 03:30:18PM +0800, wu shi wrote:
> Hi,
> I am wondering if it is normal that guest created on partition is slower
> thatn guest created on a file(created using dd).
> 
> I have created two guest using virt-install.One is on my /dev/hda5 (guest
> name is partition)
> while the other on /storage/vmdisk.img (dd if=/dev/zero
> of=/storage/vmdisk.img bs=1024k count=1024  )guest name is file
> 
> using hdparm -tT in these two guests shows the throughput of partition is
> 3-5Mb/s,while the number on guest file is around 30.
> 
> This discrepancy is quite huge.
> Is this normal?
> 

Possibly because of memory caching in dom0 for file based disk? 

-- Pasi


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