Re: [Xen-users] Xen HD performance

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Sami Dalouche wrote:
> Hi,
>
> Can anyone point me to some information about the behaviour of Xen
> concerning Disk I/O.
>
> What happens on my computer is that whenever I activate Xen, the I/O
> capability of my hard drives is divided by the number of Xen virtual
> machines.
>   
Even when the other domains are not busy? I mean, disk I/O bandwidth and 
bandwidth to the disk controller has to be shared, but if only one 
domain is using it, I'd expect it to be disk bound: disk I/O is 
expensive in a virtualized environment, but it shouldn't cost *too* much 
if hte guest domains are not churning the disk.

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