🚀 go-pugleaf

I've recently encountered a strange Windows performance problem
that has me stumped.

Configuration:
	Clone 80486DX - 33 MHz
	8MB Ram
	6MB Perm. Swap file (32-bit disk access)
	Stock Windows 3.1 configuration (problem exists with fresh install)
	SMARTDRV 4.0 configured for 2MB XMS (prior to and during Windows)
	
Problem:
	A simple CPU performance test - run in a full-screen (not windowed)
	DOS session from Windows 386 ehanced mode runs at about 1/3 normal
	speed.
	
	Normal performance can be restored by constraining SMARTDRV to a small
	cache size (say 256K) during Windows.
	
	Problem occurs when using QEMM 6.02 or HIMEM.SYS.
	
	Problem occurs if PC-TOOLS 7.1 PC-CACHE is substituted in place
	of SMARTDRV.
	
Puzzles:
	On the surface it might appear that Windows was memory constrained but
	no other applications are competing for the 8MB real and 6MB virutal
	memory. Windows Help-About shows large free memory and resources.
	
	The CPU test in the DOS session does no disk I/O - it is just a
	CPU test.
	
	Remember - this is stock 3.1 - no customizations of SYSTEM.INI.
	
	Similarly configured machines (better brands) do not exhibit this
	dramatic slow-down).
	

Any ideas or suggestions where to look?


Many thanks

Bill Wilder, Computer Systems Manager     Internet: WILDER@NSRSKE.AGR.CA
Research Station, Agriculture Canada
Kentville, Nova Scotia CANADA             Phone:    (902) 679-5577
B4N 1J5                                   Fax:      (902) 679-2311
-- 
Bill Wilder, Computer Systems Manager 
Kentville Research Station
Agriculture Canada
Kentville, Nova Scotia