Microsoft KB Archive/39485

= MS-DOS: Maximum Usage of FASTOPEN in Expanded Memory =

Article ID: 39485

Article Last Modified on 11/16/2006

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APPLIES TO


 * Microsoft MS-DOS 4.0 Standard Edition
 * Microsoft MS-DOS 4.01 Standard Edition
 * Microsoft MS-DOS 5.0 Standard Edition
 * Microsoft MS-DOS 5.0a
 * Microsoft MS-DOS 6.0 Standard Edition
 * Microsoft MS-DOS 6.2 Standard Edition
 * Microsoft MS-DOS 6.21 Standard Edition
 * Microsoft MS-DOS 6.22 Standard Edition

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This article was previously published under Q39485



SUMMARY
With MS-DOS versions 4.0 and later, FASTOPEN.EXE has been enhanced to allow the use of expanded memory to store the cached information. The amount of expanded memory that FASTOPEN can use is 16K, one expanded memory page.



MS-DOS Version 4.0
FASTOPEN allows two parameters: (m,n). The m parameter specifies the number of files FASTOPEN can work with, and the n parameter specifies the number of file extents FASTOPEN can work with. FASTOPEN needs approximately 48 bytes for each file and 16 bytes for each file extent specified. Given these values, then you can decide the proper values for (m,n) that fit in one page and provide the optimal performance for the type of work being done.

MS-DOS Versions 5.0 and Later
MS-DOS versions 5.0 and later use the /X switch to create the name cache in expanded memory instead of in conventional memory.

Additional query words: 6.22 4.00 4.01 5.00 5.00a 6.00 6.20

Keywords: KB39485

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