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Re: [Xen-users] Xen HD performance

To: Sami Dalouche <skoobi@xxxxxxx>
Subject: Re: [Xen-users] Xen HD performance
From: Nico Kadel-Garcia <nkadel@xxxxxxxxx>
Date: Tue, 15 May 2007 08:05:14 +0100
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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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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