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Troubleshooting in the Protected-Mode Environment
A-3
Troubleshooting DOS Systems
The PMINFO32.EXE program
Purpose: Run PMINFO.EXE to determine the performance of protected/
real-mode switching and extended memory.
Notes: The time-based measurements made by PMINFO may vary
slightly from run to run.
If this error message appears:
DOS/16M error: [17] system software does not follow VCPI
or DPMI specifications
check for a statement in your
CONFIG.SYS containing
NOEMS. If such a statement exists, remove it and reboot your
computer.
If the computer is not equipped with extended memory or if
none is available for DOS/4GW, the extended-memory
measurements do not display.
Other DOS/4GW error messages are in Section A.3,
DOS/4G
Error Messages
.
Example: The following example shows the output of the PMINFO pro-
gram on an 80486 AT-compatible machine running at
33 MHz.
–================================= PMINFO =======================================–
Protected Mode and Extended Memory Performance Measurement –– 4.45
Copyright (c) Tenberry Software, Inc. 1987 – 1996
DOS memory Extended memory CPU performance equivalent to 33.0 MHz 80486
–––––––––– –––––––––––––––
640 17854 K bytes configured (according to BIOS).
640 31744 K bytes physically present (SETUP).
550 17585 K bytes available for DOS/16M programs.
21.6 (0.0) 19.1 (0.5) MB/sec word transfer rate (wait states).
35.4 (0.5) 34.4 (0.5) MB/sec 32–bit transfer rate (wait states).
Overall cpu and memory performance (non–floating point) for typical
DOS programs is 7.78 0.62 times an 8MHz IBM PC/AT.
Protected/Real switch rate = 18078/sec (55 sec/switch, 33 up + 21 down),
DOS/16M switch mode 11 (VCPI).