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-devel

Re: [Xen-devel] difference between xen hypervisor and common kernel on h

To: Lin-bao Zhang <zhang.linbao@xxxxxxxxx>
Subject: Re: [Xen-devel] difference between xen hypervisor and common kernel on handling BIOS's e820 map ?
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Tue, 30 Aug 2011 10:00:31 -0400
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Tue, 30 Aug 2011 07:04:58 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <1314681899.56694.YahooMailNeo@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <1314681899.56694.YahooMailNeo@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.21 (2010-09-15)
On Mon, Aug 29, 2011 at 10:24:59PM -0700, Lin-bao Zhang wrote:
> in a same , I have xen-kernel and common kernel installed ,
> in grub.conf , just like this:
> 
> title Red Hat Enterprise Linux Server (2.6.18-268.el5xen)
> root (hd0,0)
> kernel /boot/xen.gz-2.6.18-268.el5  loglvl=all guest_loglvl=all sync_console 
> console_to_ring com1=115200,8n1 console=com1
> module /boot/vmlinuz-2.6.18-268.el5xen ro root=LABEL=/1 console=hvc0 
> earlyprintk=xen nomodeset

You don't need nomodeset on '2.6.18' kernels.

> module /boot/initrd-2.6.18-268.el5xen.img
> 
> title Red Hat Enterprise Linux Server (2.6.18-268.el5)
>         root (hd0,0)
>         kernel /boot/vmlinuz-2.6.18-268.el5 ro root=LABEL=/1 console=tty0 
> console=ttyS0,115200
>         initrd /boot/initrd-2.6.18-268.el5.img
> 
> --------------
> but I found difference about e820map from the two kernels :
> 
> common kernel: --------------------------------
> BIOS-provided physical RAM map:
>  BIOS-e820: 0000000000010000 - 0000000000090400 (usable)
>  BIOS-e820: 0000000000090400 - 0000000000a0000 (reserved)
>  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
>  BIOS-e820: 0000000000100000 - 000000007f5f0000 (usable)
>  BIOS-e820: 000000007f5f0000 - 000000007f62c000 (ACPI data)
>  BIOS-e820: 000000007f62c000 - 000000007f62d000 (usable)
>  BIOS-e82: 000000007f62d000 - 00000000779d000 (reserved)
>  BIOS-e820: 0000000779d000 - 000000007f7a0000 (ACPI data)
>  BIOS-e0: 00000007f7a0000 - 0000000090000000 (reserved)
>  BIOS-e820: 00000000fec00000 - 00000000fee10000 (reserved)
>  BIOS-e820: 00000000ff800000 - 0000000100000000 (eservd)
>  BIOS-e820: 0000000100000000 -0000000480000000 (usable)
>  BIOS-e820: 0000002000000000 - 0000002400000000 (usable)
>  BIOS-e820: 0000004000000000 - 0000004400000000 (usable)
>  BIOS-e820: 0000006000000000 - 00000600000000 (usable)
> 
> xen-kernel:
>  Xen-e820 RAM map:
> (XEN)  0000000000000000 - 0000000000090400 (usable)
> (XEN)  0000000000090400 - 00000000000a0000 (reserved)
> (XEN)  00000000000f0000 - 0000000000100000 (reserved)
> (XEN)  0000000000100000 - 000000007f5f0000 (usable)
> (XEN)  000000007f5f0000 - 000000007f62c000 (ACPI data)
> (XEN)  000000007f62c000 - 000000007f62d000 (usable)
> (XEN)  000000007f62d000 - 000000007f79d000 (reserved)
> (XEN)  000000007f79d000 - 000000007f7a0000 (ACPI data)
> (XEN)  000000007f7a0000 - 0000000090000000 (reserved)
> (XEN)  00000000fec00000 - 00000000fee10000 (reserved)
> (XEN)  00000000ff800000 - 0000000100000000 (reserved)
> (XEN)  0000000100000000 - 0000000480000000 (usable)
> (XEN)  0000002000000000 - 0000002400000000 (usable)
> (XEN)  0000004000000000 - 0000004400000000 (usable)
> (XEN)  0000006000000000 - 0000006400000000 (usable)      
> (XEN) System RAM: 65525MB (67098116kB)
> 
> I diff them in a picture :

Huh? Can you just do a diff of the two texts or just
do <=== on the email to point to it?

> 
> 
> as my existing knowledge , e820 map information is provided by BIOS ,it 
> should be same for all OS(windows and linux) , OS just use it . 
> but why xen-kernel's e820 map is different from that of common-kernel.
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel

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