xqcam speed figures

Wim Lewis writes:

 > A quick calculation shows that it takes a minimum of 320x240x(3/2)x6 
 > or 691200 I/O operations to fetch a 320x240x6 frame, which means
 > my fastest numbers are doing about 1 million I/O ops per second. 
 > My (unsupported) hunch is that the I/O is the big bottleneck.
 > My parallel port is on a card, not on the motherboard, and might
 > well be particularly slow.

The ISA bus requires a 1usec hang for every I/O operation.  Sounds to
me like you're running code from the cache, and writing the results to
non-ISA memory.

-russ <nelson@crynwr.com>    http://www.crynwr.com/~nelson
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