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

Re: [Xen-users] 32bit vs 64bit memory usage question

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] 32bit vs 64bit memory usage question
From: Tom Miller <madprogextrodinr@xxxxxxxxx>
Date: Mon, 05 Feb 2007 10:00:35 -0500
Delivery-date: Mon, 05 Feb 2007 07:00:31 -0800
Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:user-agent:mime-version:to:subject:references:in-reply-to:content-type:content-transfer-encoding; b=ZtTV3p8skMiwj+2zdp/kCDory2R39D+8xHb/qQCP8wz3aIlIU+l1T9PZgsygPNQGtozCOvPlImtZBoInb1gn71Wrm020NeCcH83BOtQTIDk1gmk4EVK62uEKQzM5H/GHG0yii5pzFV3G85UvnoXdzOlq3uCk2stgYljdWMb4mOs=
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <BAY124-DAV28223A55AFFE7204DD4E6AC990@xxxxxxx>
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: <BAY124-DAV28223A55AFFE7204DD4E6AC990@xxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Thunderbird 1.5.0.9 (Windows/20061207)
Jamie Burns wrote:
Hello,

I recently installed a minimal 32bit version of Debian Etch, and then also installed Xen from Debian's package repository.

When Xen booted up, memory usage was just below 40MB (typical for such a debian install).

Then I decided to do the exact same install, but using the 64bit version of Debian Etch and Xen.

This time when Xen booted up, memory usage was just over 90MB - at least double that of the 32bit version.

Can anybody explain this to me? Why 64bit XEN would use double the memory?

If I try 32bit vs 64bit debian without using XEN, then memory use about 30MB with each - no doubling.

Jamie Burns.

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

64 bit pointers and 64 bit memory address slots are twice as big as
corresponding 32 bit ones.   So unless you have 4 GB of memory or more,
using 64bit software is actually slower for the system, not faster.


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