WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

[Xen-users] Re: Runing dbench on virtual domains, incorrect results!

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Re: Runing dbench on virtual domains, incorrect results!
From: Parissa Heidari <parisa.heidari@xxxxxxxxxx>
Date: Mon, 28 May 2007 23:36:53 -0400
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Mon, 28 May 2007 20:34:33 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <200705281216.12986.parisa.heidari@xxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <200705281216.12986.parisa.heidari@xxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: KMail/1.9.1
I found out my fault. I had a problem with the scheduling algorithm in 
configuration files. Sorry.

On Monday 28 May 2007 12:16, Parissa Heidari wrote:
> Hi,
> I'm running dbench on Xen-dom0, Xen-domU and a real machine to measure the
> performance loss of virtual machines in comparison withe real one.
>
> The machine has 2 cpus but I have disabled hyperthreading in the bias and
> all my kernels are compiled with SMP disabled. And also its total available
> RAM is 2GB but I have limited available RAM in the kernel command line of
> all machines. SO my real machine has 900MB, dom0 900MB and also my domU has
> 900MB.
>
>
> Surprisingly, I see that Xen increases the performance! I have repeated my
> tests many times but the result is the same.
>
> Here is my results:
> Real machine, unmodified kernel: 237 MB/sec
> Xen-dom0 ( no domU created. dom0 is running lonely) : 261 MB/sec
> Xen-domU (just 1 doU is running besid dom0) : 284 MB/sec
>
> Seeing better performance on a domU is not so surprising because however
> Dom0 has 900MB, and a domU also 900MB and they have some collaborations to
> access the disk and ..., but I have no idea about what I see on dom0. Is
> this because of bad measurement of time in virtual machines?
>
> I appreciate your suggestion  or justification,
> Parissa.

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

<Prev in Thread] Current Thread [Next in Thread>