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Not all of the system's memory appears to be detected by the operating system

This document (3665938) is provided subject to the disclaimer at the end of this document.

Environment

Novell SUSE Linux Enterprise Server 10
Novell SUSE Linux Enterprise Server 9
Novell SUSE Linux Enterprise Server 8
Novell Linux Desktop
Novell SUSE Linux Enterprise Desktop 10

x86-64 architecture (AMD64 or Intel EM64T)

System has 3.5 GB of memory or more


Situation

Not all of the system's memory appears to be detected by the operating system.

Resolution

A PC system needs to reserve a part of the memory addresses for input/output use by devices like extension cards. When a system has 3.5GB or more of memory, this can cause part of the memory to be inaccessible.

On some systems, the BIOS offers a feature known as "memory remapping" or "memory hoisting" which can reduce the amount of memory invisible to the system. This option however is known to cause problems for some configurations and should only be used after extensive testing of an identical system in a test environment.

Additional Information

A PC system needs to reserve a part of the memory addresses for input/output use by devices like extension cards. When a system has 3.5GB or more of memory, this can cause part of the memory to be inaccessible.
This problem is sometimes known as the "PCI memory hole" or simply as the "memory hole".

Formerly known as TID# 10099487

Disclaimer

This Support Knowledgebase provides a valuable tool for NetIQ/Novell/SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:3665938
  • Creation Date:15-SEP-06
  • Modified Date:27-APR-12
    • SUSESUSE Linux Enterprise Desktop
      SUSE Linux Enterprise Server

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