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- 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
-
-
-