MS-DOS: Maximum Usage of FASTOPEN in Expanded Memory (39485)
The information in this article applies to:
- Microsoft MS-DOS operating system 4.0
- Microsoft MS-DOS operating system 4.01
- Microsoft MS-DOS operating system 5.0
- Microsoft MS-DOS operating system 5.0a
- Microsoft MS-DOS operating system 6.0
- Microsoft MS-DOS operating system 6.2
- Microsoft MS-DOS operating system 6.21
- Microsoft MS-DOS operating system 6.22
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.
MORE INFORMATIONMS-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.
| Modification Type: | Major | Last Reviewed: | 5/12/2003 |
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| Keywords: | KB39485 |
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