Microsoft KB Archive/129952

= PC NTMMTA: No Limitations on Memory Management =

Article ID: 129952

Article Last Modified on 10/30/2006

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APPLIES TO


 * Microsoft Mail Multitasking Message Transfer Agent 3.2a

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This article was previously published under Q129952



SUMMARY
The Mail Multitasking MTA (MMTA) for OS/2, running OS/2 version 1.3, is limited to 16 megabytes of memory. However, the MMTA running under Microsoft Windows NT can use all available memory on the Windows NT machine.



MORE INFORMATION
Some of the memory management limitations of OS/2 1.x are removed. The most important of these is the limit of 16 MB of physical RAM. The OS/2 subsystem uses the large memory capability of Windows NT. As a result, you get an increase in performance, and the applications can use the additional memory.

Protection Model
The OS/2 subsystem implements protection between OS/2 applications. It constructs their address spaces (both the flat address space and LDTs) and implements the same protection as in OS/2.

Segment Swapping
The OS/2 subsystem uses the Windows NT paging mechanism; no segment swapping is performed. Paging works better than segment swapping, and it exists in OS/2 only to support the 80286 processor, which is not supported in Windows NT.

Additional query words: 3.20

Keywords: KB129952

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