3GB switch for Win2K professional

[Rikki]

I have added the new option to the boot.ini file to
increase my application memory from default 2GB to 3GB.
The boot.ini file shown as bellow:

multi(0)disk(0)rdisk(0)partition(2)\WINNT="Microsoft
Windows 2000 Professional" /fastdetect /3GB

I can't really see any difference in Windows Task Manager
after the change. Is there any parameter to look for to
make sure that the change has taken place?

I have 2GB installed physical memory on the system.

best regards,

Rikki

 

[Bill Peele [MS]]

--------------------

From: "Rikki" <[email protected]>
Subject: 3GB switch for Win2K professional
Date: Sun, 11 Apr 2004 23:29:46 -0700
Newsgroups: microsoft.public.win2000.applications

I have added the new option to the boot.ini file to
increase my application memory from default 2GB to 3GB.
The boot.ini file shown as bellow:

multi(0)disk(0)rdisk(0)partition(2)\WINNT="Microsoft
Windows 2000 Professional" /fastdetect /3GB

I can't really see any difference in Windows Task Manager
after the change. Is there any parameter to look for to
make sure that the change has taken place?

I have 2GB installed physical memory on the system.

best regards,

Rikki

----

Rikki,

When the /3GB switch is used with Windows 2000 Professional or with Windows 2000 Server, the kernel components are
loaded into the memory space by using the 4 GB RAM Tuning feature in the same way as they load in Windows 2000
Advanced Server and in Windows 2000 Datacenter Server. This functionality lets device-driver developers test their
drivers in this configuration without having to install Windows 2000 Advanced Server or Windows 2000 Datacenter Server.
The user-mode memory space is still limited to 2 GB.

The use of the /3GB switch from the Boot.ini file with Windows 2000 Professional or with Windows 2000 Server can give the
appearance of a 3 GB range of user-mode memory. However, the memory from 0x80000000 through 0xBFFFFFFF is not
usable. Because kernel-mode components are now limited to using from 0xC0000000 through 0xFFFFFFF memory range,
developers can test kernel-mode components without having to install Windows 2000 Advanced Server, Windows 2000
Datacenter Server, or the Windows Server 2003 family of products.

The two paragraphs above come from the following article.

291988 - A Description of the 4 GB RAM Tuning Feature and the Physical Address Extension Switch
http://support.microsoft.com/default.aspx?scid=kb;en-us;291988

Bill Peele
Microsoft Enterprise Support

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