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-devel] Re: [Xen-users] Max. PV and HVM Guests

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] Re: [Xen-users] Max. PV and HVM Guests
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@xxxxxxxxx>
Date: Mon, 9 Nov 2009 22:37:21 +0800
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, space.time.universe@xxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx, Robert Dunkley <Robert@xxxxxxxxx>
Delivery-date: Mon, 09 Nov 2009 06:38:37 -0800
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=yj5Z052SpC7049IbyIKyvLtbdySz1FvmRQ1dV3LsYpk=; b=u0M+Oss+jPgkRq6qyeJRsm+nUWSR9eD8PpIj1+WWH/Txi4fqF7/144r0c7stdvpeKu 2klHoirB07vNciGG2F0+9BoseL5bNaHO58y7Kxdn6PvEvz7BWK+uELKM+hgts67SKAjh OcBTemZEmzYCuF1tY2V2joveoqCwJjchFZKH8=
Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=FaQf1x8VFLTWLt26ie6DG9m5s+luPd6JpjpOWFlI3k23tTHIgDOn3IPBwt2b48cr3L aobe+FdcwiM/IPkftfCChfVTP08O8Pw4Tb3ai0BLvOAh9cfPyHSvVVLLr+GUu2yT6CvM K0qqaLs5jHraBtSRjW3NmPm2CVWIGWZlUvf78=
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <f712b9cf0911090510s50ce42eaxf2beff3cc5a361e7@xxxxxxxxxxxxxx>
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/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <f712b9cf0911080345g2fce2e9fpc998ddcae0afd55b@xxxxxxxxxxxxxx> <1257685302.5339.11.camel@xxxxxxxxxxxx> <C1EAC9C5E752D24C968FF091D446D8234ACCD2@ALTERNATEREALIT> <f712b9cf0911090252n4e5905a4j76aacd35a5bc786d@xxxxxxxxxxxxxx> <20091109115458.GF16033@xxxxxxxxxxx> <f712b9cf0911090401o49723f40waf1707e788ef0b20@xxxxxxxxxxxxxx> <20091109120557.GG16033@xxxxxxxxxxx> <f712b9cf0911090414gf13a9e2w9b52a88e498a484e@xxxxxxxxxxxxxx> <20091109121811.GH16033@xxxxxxxxxxx> <f712b9cf0911090510s50ce42eaxf2beff3cc5a361e7@xxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Hi All,

I have discovered that setting dom0_mem also solves another problem I am facing.

Previously I have complained that, after starting a HVM guest, in any pv-ops dom0 kernels 2.6.31.X, dom0 will be very slow, sluggish, and unresponsive, such that it is nearly impossible to start another HVM virtual machine.

Now, after setting dom0_mem, I booted up into pvops dom0 kernel 2.6.31.5, I started all 5 Rocks HPC cluster compute nodes at one go. And guess what? Dom0 is not even sluggish! I could still do desktop screen video capturing!

Voila! Setting dom0_mem is really killing two birds with one stone. It raises the number of VMs that I can start and also resolves the sluggishness in dom0 (pvops kernels 2.6.31.X affected; 2.6.30-rc3 is NOT affected) after starting a virtual machine.

Setting dom0_mem really does wonders.

Thank you Pasi!

--
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@xxxxxxxxx
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Mon, Nov 9, 2009 at 9:10 PM, Mr. Teo En Ming (Zhang Enming) <space.time.universe@xxxxxxxxx> wrote:
Great! After setting dom0_mem=1024M, I can start all 5 nodes of my Rocks HPC cluster without crashing dom0 as compared to the previous limit of 3 nodes when I did not set dom0_mem.

Thank you Pasi! Another resource problem solved.

Here's my latest grub.conf:

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/mapper/vg_fedora11_host-lv_root
#          initrd /initrd-version.img
#boot=/dev/sda
default=4
timeout=100
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.31.5-xen-enming.teo)
    root (hd0,0)
#    kernel /vmlinuz-2.6.31.5-xen-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.31.5-xen-enming.teo.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.31.5-xen-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
    module /initrd-2.6.31.5-xen-enming.teo.img
title Fedora (2.6.31.4-xen-enming.teo)
    root (hd0,0)
#    kernel /vmlinuz-2.6.31.4-xen-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.31.4-xen-enming.teo.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.31.4-xen-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
    module /initrd-2.6.31.4-xen-enming.teo.img
title Fedora (2.6.31.1-xen-enming.teo)
    root (hd0,0)
#    kernel /vmlinuz-2.6.31.1-xen-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.31.1-xen-enming.teo.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.31.1-xen-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
    module /initrd-2.6.31.1-xen-enming.teo.img
title Fedora (2.6.31-enming.teo)
    root (hd0,0)
    kernel /vmlinuz-2.6.31-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
    initrd /initrd-2.6.31-enming.teo.img
title Fedora (2.6.30.5-enming.teo)
    root (hd0,0)
    kernel /vmlinuz-2.6.30.5-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
    initrd /initrd-2.6.30.5-enming.teo.img
title Fedora (2.6.18.8-enming.teo)
    root (hd0,0)
#    kernel /vmlinuz-2.6.18.8-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.18.8-enming.teo.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.18.8-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root 
    module /initrd-2.6.18.8-enming.teo.img
title Fedora (2.6.31-rc6-enming.teo) with Serial Console
        root (hd0,0)
#       kernel /vmlinuz-2.6.31-rc6-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#       initrd /initrd-2.6.31-rc6-enming.teo.img
        kernel /xen.gz dom0_mem=1024M iommu=1 iommu_inclusive_mapping=1 com1=115200,8n1 console=com1
#       module /vmlinuz-2.6.31-rc6-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 xencons=ttyS0 console=ttyS0,115200
    module /vmlinuz-2.6.31-rc6-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 console=hvc0 earlyprintk=xen
        module /initrd-2.6.31-rc6-enming.teo.img
title Fedora (2.6.30-rc3-enming.teo-tip) with Serial Console
        root (hd0,0)
#       kernel /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#       initrd /initrd-2.6.30-rc3-enming.teo-tip.img
        kernel /xen.gz dom0_mem=1024M iommu=1 iommu_inclusive_mapping=1 com1=115200,8n1 console=com1
#       module /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 xencons=ttyS0 console=ttyS0,115200
    module /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 console=hvc0 earlyprintk=xen
        module /initrd-2.6.30-rc3-enming.teo-tip.img

title Fedora (2.6.31-rc6-enming.teo)
    root (hd0,0)
#    kernel /vmlinuz-2.6.31-rc6-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.31-rc6-enming.teo.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.31-rc6-enming.teo ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
    module /initrd-2.6.31-rc6-enming.teo.img
title Fedora (2.6.30-rc3-enming.teo-tip)
    root (hd0,0)
#    kernel /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
#    initrd /initrd-2.6.30-rc3-enming.teo-tip.img
    kernel /xen.gz dom0_mem=1024M iommu=1
    module /vmlinuz-2.6.30-rc3-enming.teo-tip ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0 nomodeset
    module /initrd-2.6.30-rc3-enming.teo-tip.img
title Fedora (2.6.29.4-167.fc11.x86_64)
    root (hd0,0)
    kernel /vmlinuz-2.6.29.4-167.fc11.x86_64 ro root=/dev/mapper/vg_fedora11_host-lv_root rhgb quiet selinux=0
    initrd /initrd-2.6.29.4-167.fc11.x86_64.img


--
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@xxxxxxxxx
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Mon, Nov 9, 2009 at 8:18 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
On Mon, Nov 09, 2009 at 08:14:27PM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
>    What is a good value for dom0_mem if I want to start X server and run
>    GNOME? Will 512 MB be too little?
>

Go for 1024 MB then..

-- Pasi









_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users
<Prev in Thread] Current Thread [Next in Thread>