Buffer copying?

[Peregrine McGehee <mcgehee@cfht.hawaii.edu>]

I have an application in which I'm sending small images across the
network via channel access and I'm curious as to how many times and
where the image buffer gets copied on its way up from the database to 
the ethernet interface. 

Sending 15 512x31 sub-images every few seconds increases my Sparc 5
IOC loading by up to 20%.

The data is referenced via the BPTR field of a WAVEFORM record. I'll
probably change the record type behavior since WAVEFORM allocates the
buffer to define BPTR whereas all I really need to do is to have BPTR
point to the correct VMEbus address to read the DT-1451.

Aloha,
	Peregrine

-- 
-------------------------------------------------------------------------------
Peregrine M. McGehee			http://www.cfht.hawaii.edu/~mcgehee
Telescope Control Systems Group 	Canada-France-Hawaii Telescope
(808) 885-3178				P.O. Box 1597, Kamuela, Hawaii 96743