maximum supported memory for Fedora

Posted on 2005-03-29
Medium Priority
Last Modified: 2013-12-06
Downloaded Fedora for evaluation purposes in our small office today.  Mainly we're going to be running VMware Server GSX for a large scale lab environment.

We're wanting to squeeze every bit of memory out of the servers we can, thus why the linux based solution.

I found this website which describes the maximum memory configuration supported by Red Hat Linux Enterprise server:


What I need to know is, does the Fedora product have the same specifications, or can someone supply me a link to its maximum memory capacity?

Question by:divi2323
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
LVL 15

Accepted Solution

veedar earned 2000 total points
ID: 13654847
On my Fedora Core 3 systems the kernel docs say the maximum memory for x86 is 64GB

Look here...

And here's the relevant section from Configure.help...

"High Memory support
  Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  However, the address space of 32-bit x86 processors is only 4
  Gigabytes large. That means that, if you have a large amount of
  physical memory, not all of it can be "permanently mapped" by the
  kernel. The physical memory that's not permanently mapped is called
  "high memory".

  If you are compiling a kernel which will never run on a machine with
  more than 960 megabytes of total physical RAM, answer "off" here (default
  choice and suitable for most users). This will result in a "3GB/1GB"
  split: 3GB are mapped so that each process sees a 3GB virtual memory
  space and the remaining part of the 4GB virtual memory space is used
  by the kernel to permanently map as much physical memory as

  If the machine has between 1 and 4 Gigabytes physical RAM, then
  answer "4GB" here.

  If more than 4 Gigabytes is used then answer "64GB" here. This
  selection turns Intel PAE (Physical Address Extension) mode on.
  PAE implements 3-level paging on IA32 processors. PAE is fully
  supported by Linux, PAE mode is implemented on all recent Intel
  processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  then the kernel will not boot on CPUs that don't support PAE!

  The actual amount of total physical memory will either be auto
  detected or can be forced by using a kernel command line option such
  as "mem=256M". (Try "man bootparam" or see the documentation of your
  boot loader (grub, lilo or loadlin) about how to pass options to the
  kernel at boot time.)"


Featured Post

Percona Live Europe 2017 | Sep 25 - 27, 2017

The Percona Live Open Source Database Conference Europe 2017 is the premier event for the diverse and active European open source database community, as well as businesses that develop and use open source database software.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Setting up Secure Ubuntu server on VMware 1.      Insert the Ubuntu Server distribution CD or attach the ISO of the CD which is in the “Datastore”. Note that it is important to install the x64 edition on servers, not the X86 editions. 2.      Power on th…
Google Drive is extremely cheap offsite storage, and it's even possible to get extra storage for free for two years.  You can use the free account 15GB, and if you have an Android device..when you install Google Drive for the first time it will give…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
Suggested Courses
Course of the Month13 days, 21 hours left to enroll

800 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question