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WINCOM.FAX
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1994-12-01
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Communication setting for WIN-OS2 4/27/94
File:WNOS2COM.fax 4/20/94
TITLE: 931012 COMMUNICATIONS (COM) SETTINGS FOR WIN-OS/2
SESSIONS
DESCRIPTION OF SYMPTOMS:
Communications speed is slow for Windows applications running
in WIN-OS/2 sessions.
SUMMARY OF RESOLUTION:
Each of the settings will affect COM speed for the
applications differently depending on whether they are
changed independently or in conjunction with others.
DETAIL OF RESOLUTION:
1. There are new COM.SYS and VCOM.SYS on BBS called
SIO102.ZIP.
Note: These drivers are written in assembly and are
developed to increase speed. Also they have
different settings that are registered with
WIN-OS/2 settings. Customers are to use these
at their own discretion. Also there is a
half-duplex setting call RTS that can give
significant speed improvements.
2. Set EMS_MEMORY_LIMIT to ZERO unless the application can
only use EMS memory. EMS memory is slower than XMS
memory. Use XMS or DPMI instead.
3. If not using HPFS, remark (REM) out HEIFS=C:\OS2\HPFS.IFS
/CACHE:64 /CRECL:4 /AUTOCHECK:F. Note: REM this out, not
delete, in case the line is needed later.
4. Set PRIORITY_DISK_IO=NO. This will not give foreground
application's priority boost over the background ones.
5. Remove the /UMB from the DEVICE=C:\OS2\MDOS\VXMS.SYS
/UMB in the OS2 config.sys. It is possible Windows is
using the UMB area. Deleting the use of the UMB area may
resolve memory leakage and conflicts.
6. Set DOS=LOW,NOUMB in your config.sys. Again this may
prevent conflict.
7. For the DISKCACHE=1024,LW,AC:G in the OS2 config.sys
delete the LW parameter. This is the lazy write
feature and it is checked exiting the OS2 kernel.
Not having lazy write definitely increases COM
performance.
8. Set MAXWAIT to 1 for a fast CPU. Leave this to 3 for a
slow CPU.
9. Otherwise there are WIN-OS/2 settings that can be
changed:
Pg 2
a. IDLE_SECONDS to 60 (maximum)
b. IDLE_SENSITIVITY to 100 (maximum)
c. HW_TIMER to ON
d. HW_ROM_TO_RAM to ON
e. COM_DIRECT_ACCESS to OFF
f. COM_HOLD to ON
g. COM_RECEIVE_BUFFER_FLUSH to NONE
h. COM_SELECT to the port used
12/31/99