Eric,
>> Having to "discard" DOS directories, to make room for new
>> data files, is the main loss of speed when using UIDE ...
>
> A cache might already "know" that the directories are more
> useful because they are accessed more often ...
I did not want to add such logic in UIDE, because I dare not
"trust" that each DOS variant works the same. At run-time,
UIDE uses exactly one "system resource", the Int 13h vector.
This makes it "generic" and lets it run on all DOS variants.
I do not even use interrupts ("polling" only) since some old
Intel chipsets with "errata" (bugs!) had interrupt problems!
> ... Also, you do not have to cache data on the first write,
> you can wait until it is read again before caching it ...
This would also add code in UIDE (a table of "pending cache"
disk output areas), that I do not want to include. At 5.5K
of run-time code, 4.6K of which can be "stashed" in the HMA,
UIDE is rather efficient as-is, and I want to keep it so.
> ... Another question is how often people copy 100-MB files
> on "non-Windows" DOS systems and whether it bothers them
> that doing so, with a small cache, will "flush out" useful
> data such as FATs and directory data from the cache,
> temporarily reducing speed.
I "got into" device drivers back in 2003 because I still use
V6.22 MS-DOS to backup/restore my Windows/NT system. I bet
many folks use DOS as a "simple" (and cheap!) backup/restore
system for Gawd-AWFUL Windows, rather than spending money on
some equally Gawd-AWFUL Windows application program! File-
copy speed in such operations still matters to me, and since
memory is now ludicrously cheap, why not USE it for a cache?
> PS: Best wishes for your speedy operation recovery ...
Thanks! I am "up and about", but food with high fat levels
still HURTS when I eat it, due to "less" digestive fluids in
my system! The Doc says it can take 18 months to "get used
to this", so I must simply be patient.
Jack R. Ellis
------------------------------------------------------------------------------
Magic Quadrant for Content-Aware Data Loss Prevention
Research study explores the data loss prevention market. Includes in-depth
analysis on the changes within the DLP market, and the criteria used to
evaluate the strengths and weaknesses of these DLP solutions.
http://www.accelacomm.com/jaw/sfnl/114/51385063/
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