mvme5500: data transfer rate to and from vme space

[rwas]

Hello,

I've done some timing measurements on block transfers of data from the 
vme space to
local memory space. My effective transfer rate is about 2mbytes/sec. In 
theory, the vme
backplane can handle about 20mbytes/sec. I've checked this for various 
block sizes and
the transfer rate scales roughly proportionally with size.


word size: 32bit (transfers are 32bits at a time)
block size: 256bytes: 150uS
block size: 1040bytes: 530uS
block size: 3032byes: ~1.2mS

addr space: 32bit

rtems: 4.9.3


Help appreciated.

Robert W.