Latest LQ Deal: Latest LQ Deals
Go Back > Forums > Linux Forums > Linux - General
User Name
Linux - General This Linux forum is for general Linux questions and discussion.
If it is Linux Related and doesn't seem to fit in any other forum then this is the place.


  Search this Thread
Old 05-20-2009, 09:40 PM   #1
LQ Newbie
Registered: May 2009
Posts: 2

Rep: Reputation: 0
re: Installing 32bit linux to 64-bit machine?

Hi Guys,

Wonder if anyone can help to answer this question. Basically I need to know whether I can run 32-bit RHEL4.6 in x86-64-bit Server and what are the main things that I really to look into when deploying 32-bit linux to 64-bit machine?

If yes, when i install additional program into 32-bit linux on 64-bit machine, will there be any issue?


Old 05-20-2009, 10:42 PM   #2
Senior Member
Registered: Nov 2006
Distribution: Debian Linux 9 (stretch)
Posts: 3,358

Rep: Reputation: 126Reputation: 126
I'm running 32-bit Lenny on an AMD Phenom. There were no install issues. I don't believe there are any 64-bit chips actually in the wild, so it should just be a matter of installing and running. Except, that you do mention "64-bit server". If that means that it has more than 4GB of RAM installed, then you will need a PAE enabled kernel to make use of it by the kernel. Your apps will still be limited to a 4GB memory footprint.
Old 05-21-2009, 06:55 AM   #3
LQ Guru
Registered: Dec 2007
Distribution: Centos
Posts: 5,286

Rep: Reputation: 1191Reputation: 1191Reputation: 1191Reputation: 1191Reputation: 1191Reputation: 1191Reputation: 1191Reputation: 1191Reputation: 1191
Originally Posted by Quakeboy02 View Post
If that means that it has more than 4GB of RAM installed, then you will need a PAE enabled kernel to make use of it by the kernel.
Even if you have just 4GB of RAM, you need a PAE enabled kernel to make use of all of it. The max ram without a PAE kernel depends on some details of your BIOS. It is often 3.25GB, rarely less, sometimes more, but never very near a full 4GB.

If you have more than 8GB of RAM with a 32 bit PAE kernel, you are likely to run into problems caused by the normal 1GB limit on kernel virtual memory. I don't know the details of the work arounds if you really need them. Most people with more than 8GB of RAM should choose a 64 bit kernel and avoid those issues. Tell us if you have more than 8GB and have a good reason to use a 32bit kernel. Maybe someone who knows those details would explain.

I think some Red Hat versions also have license restrictions on the amount of RAM, so they may give you access to less than the total your system physically has. I don't know those details either.

Other than the above, there should be no problems. The 32 bit kernel will not care that the CPU could have run 64 bit. Any x86_64 CPU can operate as a totally functional, compatible and efficient 32 bit x86 CPU. Once you are running a 32 bit kernel all installation and operation of other programs will act just as it would have on a 32 bit CPU.

Even if you have too much ram for a non PAE kernel and/or too much for some Red Hat restriction, that won't stop the system from working. It would just give you use of less than all of your ram.

Last edited by johnsfine; 05-21-2009 at 06:56 AM.


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Is it 32bit or 64 bit? garyg007 Debian 3 03-29-2009 09:57 PM
32bit or 64 bit question mokku Linux - Newbie 2 10-26-2007 02:50 PM
Installing 32 bit SUSE 10 in 64 bit machine me4linux Linux - General 2 01-22-2007 01:55 AM
64 bit cpu, 32bit kernel? cougyr Debian 7 10-03-2006 12:55 PM
Can I install 9.2-32bit on a 64 bit system? Riddick SUSE / openSUSE 5 11-21-2004 06:12 PM > Forums > Linux Forums > Linux - General

All times are GMT -5. The time now is 05:46 PM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration