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1992-07-16
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TIP #: 011
KEYWORDS: DESQview, RBBS-PC, Performance
UPDATED: July, 1990
PROBLEM: When running two or more nodes of RBBS-PC under DESQview, BBS
performance seems very slow, especially during file access and
screen updates.
SYMPTOMS: The BBS seems to be slow in doing file accesses, screen updates,
etc.
SOLUTION: There are several things which can be done to improve the
performance of RBBS-PC under DESQview. You must be fairly well
versed in DOS, RBBS, and DESQview/QEMM in order to accomplish your
goal effectively. Remember that DESQview splits up your computer
resources among the applications that you have opened. The more
efficiently that your computer operates, the more resources will be
available to your programs.
1. Use a cache. This makes a big difference in disk access. I
use ADCACHE on my board. The cache sits in expanded memory and
is 2 megabytes. I get track hits of about 95 percent. That
saves a lot of time when trying to do several things at once.
Do NOT use write caching, especially under DESQview. If you
use write caching, you may corrupt your FAT. If you use a
fairly large cache, you should be able to reduce the size of
your DOS buffers. I use Buffers=4 in my Config.Sys. This
increases the available memory to your system. I do not
recommend loading buffers high or using Quarterdeck's
Buffers.Com. I have heard of some strange things happening for
those who do.
NOTE 1: I have switched to Super PC-Kwik Cache. It is faster
than ADCACHE and seems to be aware of more hardware
and software combinations. I have also increased the
size of the cache to 3 megabytes.
2. Use a ramdisk. Some of the RBBS files may be put in a ramdisk.
This allows very fast reads of the files that do not change
during a session. I use Zenith's VDISK and set up a 1 megabyte
ramdisk. I use a batch file to copy all of my menus and my
working directories into the ramdisk. You must modify RBBS
using CONFIG to reflect the new location of these files.
3. Use a FOSSIL driver. This is important when using high speed
communications. I use X00.SYS on my board since it recognizes
DESQview with the DV switch. I set up my Dual Standard or HST
modem to communicate with the computer at 38400 baud. You
can't go faster than 19200 without using a FOSSIL driver
because RBBS does not support it. You will probably run into
problems unless you have 16550 buffered chips also. I have
increased my X00 transmit and receive buffer sizes to 4096
bytes each. The default is 1024 bytes. This allows more
effective utilization of the clock ticks that each window gets.
You may be able to increase them more depending on how much
base memory you have available.
4. Set "Dos Buffers For EMS" to 0 in the DESQview setup if you are
not running on a network. This setting made no difference when
I was using ADCACHE, but made a considerable difference when
using Super PC-Kwik.