When I boot Xen I see a message saying PAE enabled, limit 16GB. Does this mean that I can''t exceed 16GB with PAE. I''m just about to purchase a machine 32GB of memory and I don''t wish to go to x86_64. Will I have a problem? Darren _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Fri, Sep 29, 2006 at 01:50:55PM -0400, Shepherd, Darren S wrote:> When I boot Xen I see a message saying PAE enabled, limit 16GB. Does this mean that I can''t exceed 16GB with PAE. I''m just about to purchase a machine 32GB of memory and I don''t wish to go to x86_64. Will I have a problem?You really want to pay the speed penalty for using a 32bit kernel? Bastian -- But Captain -- the engines can''t take this much longer! _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Its not that, its time constraints. We have a automated system of building, deploying, creating, snapshoting, and destroying VM's. The servers, dom0 and domU are built on Centos 4.4 i386 release. I don't have the time to rebuild the environment using x86_64. The system started on small 32bit machines and has now moved to large 64bit machines. When I have time I will rebuild the environment using 64bit. The question is now that I'm getting a 32GB machine, am I forced to go through the effort of rebuilding to x86_64? -----Original Message----- From: Bastian Blank [mailto:bastian@waldi.eu.org] Sent: Friday, September 29, 2006 12:55 PM To: Shepherd, Darren S Cc: Xen-users@lists.xensource.com Subject: Re: [Xen-users] 16GB limit for PAE? On Fri, Sep 29, 2006 at 01:50:55PM -0400, Shepherd, Darren S wrote:> When I boot Xen I see a message saying PAE enabled, limit 16GB. Does this mean that I can't exceed 16GB with PAE. I'm just about to purchase a machine 32GB of memory and I don't wish to go to x86_64. Will I have a problem?You really want to pay the speed penalty for using a 32bit kernel? Bastian -- But Captain -- the engines can't take this much longer! _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Fri, Sep 29, 2006 at 04:06:48PM -0400, Shepherd, Darren S wrote:> Its not that, its time constraints. We have a automated system of building, deploying, creating, snapshoting, and destroying VM''s. The servers, dom0 and domU are built on Centos 4.4 i386 release. I don''t have the time to rebuild the environment using x86_64. The system started on small 32bit machines and has now moved to large 64bit machines. When I have time I will rebuild the environment using 64bit. The question is now that I''m getting a 32GB machine, am I forced to go through the effort of rebuilding to x86_64?Use a 64bit kernel. You don''t need to rebuild the userspace. Bastian -- But Captain -- the engines can''t take this much longer! _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Shepherd, Darren S wrote:> When I boot Xen I see a message saying PAE enabled, limit 16GB. Does this mean that I can''t exceed 16GB with PAE. I''m just about to purchase a machine 32GB of memory and I don''t wish to go to x86_64. Will I have a problem? > > >From my own experience, yes, it is the limitation of 32bit Xen kernels.You better try to find 64bit kernel binary (Xen patched of course) for your platform. I believe the 64bit kernels are available in Xen binary packages. The only question whether your hardware will like it (hopefully it will, but you never know). Otherwise, if you want to build 64bit kernel yourself on existing 32bit userspace, you will have to take some additional steps (which I believe are not very straight forward). Ideally you should try to re-deploy your system from scratch using 64bit distro.> Darren > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >-- Yuri Pismerov, System Administrator Armor Technologies (Canada) Inc. P: 905 305 1946 (x.3519) http://www.armorware.net Privacy Protection Guaranteed! _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
I have a server with 16 GB memory..! Read the warning that is your answer.! (XEN) Command line: /xen-3.0-unstable.gz com1=115200,8n1 (XEN) WARNING: Only the first 16 GB of the physical memory map can be accessed (XEN) by Xen in 32-bit mode. Truncating the memory map... (XEN) Physical RAM map: (XEN) 0000000000000000 - 000000000009f400 (usable) (XEN) 000000000009f400 - 00000000000a0000 (reserved) (XEN) 00000000000f0000 - 0000000000100000 (reserved) (XEN) 0000000000100000 - 00000000dfff3000 (usable) (XEN) 00000000dfff3000 - 00000000dfffb000 (ACPI data) (XEN) 00000000dfffb000 - 00000000e0000000 (reserved) (XEN) 00000000fec00000 - 00000000fed00000 (reserved) (XEN) 00000000fee00000 - 00000000fee10000 (reserved) (XEN) 00000000ffc00000 - 0000000100000000 (reserved) (XEN) 0000000100000000 - 0000000400000000 (usable) (XEN) System RAM: 15871MB (16252488kB) (XEN) Xen heap: 9MB (9908kB) (XEN) PAE enabled, limit: 16 GB -----Original Message----- From: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Yura Pismerov Sent: Wednesday, October 04, 2006 7:28 PM To: Shepherd, Darren S Cc: Xen-users@lists.xensource.com Subject: Re: [Xen-users] 16GB limit for PAE? Shepherd, Darren S wrote:> When I boot Xen I see a message saying PAE enabled, limit 16GB. Does > this mean that I can''t exceed 16GB with PAE. I''m just about to > purchase a machine 32GB of memory and I don''t wish to go to x86_64. > Will I have a problem? > > >From my own experience, yes, it is the limitation of 32bit Xen kernels.You better try to find 64bit kernel binary (Xen patched of course) for your platform. I believe the 64bit kernels are available in Xen binary packages. The only question whether your hardware will like it (hopefully it will, but you never know). Otherwise, if you want to build 64bit kernel yourself on existing 32bit userspace, you will have to take some additional steps (which I believe are not very straight forward). Ideally you should try to re-deploy your system from scratch using 64bit distro.> Darren > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com http://lists.xensource.com/xen-users >-- Yuri Pismerov, System Administrator Armor Technologies (Canada) Inc. P: 905 305 1946 (x.3519) http://www.armorware.net Privacy Protection Guaranteed! _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Thanks, I have a server with 12GB of RAM and the warning is not issued. I guess the warning is there only if it applies to your system. Looks like I''m moving to 64-bit. Darren -----Original Message----- From: Kevin van Kuik [mailto:kkuik@Transfer-Solutions.com] Sent: Wednesday, October 04, 2006 11:52 PM To: Yura Pismerov; Shepherd, Darren S Cc: Xen-users@lists.xensource.com Subject: RE: [Xen-users] 16GB limit for PAE? I have a server with 16 GB memory..! Read the warning that is your answer.! (XEN) Command line: /xen-3.0-unstable.gz com1=115200,8n1 (XEN) WARNING: Only the first 16 GB of the physical memory map can be accessed (XEN) by Xen in 32-bit mode. Truncating the memory map... (XEN) Physical RAM map: (XEN) 0000000000000000 - 000000000009f400 (usable) (XEN) 000000000009f400 - 00000000000a0000 (reserved) (XEN) 00000000000f0000 - 0000000000100000 (reserved) (XEN) 0000000000100000 - 00000000dfff3000 (usable) (XEN) 00000000dfff3000 - 00000000dfffb000 (ACPI data) (XEN) 00000000dfffb000 - 00000000e0000000 (reserved) (XEN) 00000000fec00000 - 00000000fed00000 (reserved) (XEN) 00000000fee00000 - 00000000fee10000 (reserved) (XEN) 00000000ffc00000 - 0000000100000000 (reserved) (XEN) 0000000100000000 - 0000000400000000 (usable) (XEN) System RAM: 15871MB (16252488kB) (XEN) Xen heap: 9MB (9908kB) (XEN) PAE enabled, limit: 16 GB -----Original Message----- From: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Yura Pismerov Sent: Wednesday, October 04, 2006 7:28 PM To: Shepherd, Darren S Cc: Xen-users@lists.xensource.com Subject: Re: [Xen-users] 16GB limit for PAE? Shepherd, Darren S wrote:> When I boot Xen I see a message saying PAE enabled, limit 16GB. Does > this mean that I can''t exceed 16GB with PAE. I''m just about to > purchase a machine 32GB of memory and I don''t wish to go to x86_64. > Will I have a problem? > > >From my own experience, yes, it is the limitation of 32bit Xen kernels.You better try to find 64bit kernel binary (Xen patched of course) for your platform. I believe the 64bit kernels are available in Xen binary packages. The only question whether your hardware will like it (hopefully it will, but you never know). Otherwise, if you want to build 64bit kernel yourself on existing 32bit userspace, you will have to take some additional steps (which I believe are not very straight forward). Ideally you should try to re-deploy your system from scratch using 64bit distro.> Darren > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com http://lists.xensource.com/xen-users >-- Yuri Pismerov, System Administrator Armor Technologies (Canada) Inc. P: 905 305 1946 (x.3519) http://www.armorware.net Privacy Protection Guaranteed! _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users