CG3 + gp1, how to configure for best X11R4 performance?

[Brad Hemminger]

We have been given a Sun 4/370 workstation, configured with a Sun cg9 card
and a graphics processor gp1 (?).  We are attempting to run some of our
X11R4 applications on it.  After some initial testing we decided that the
x11 under the cg9 would not fit our applications (24 bits as too slow),
and we have managed to obtain the loan of a cg3 (to the best of my
knowledge :-) framebuffer card.  We have installed the cg3 and it works,
however, I'm not sure that we're getting the best performance possible
with this combination.  Unluckily we have no documentation for the cg
cards or the gp cards.  If anyone could help us out with in regards to how
best to configure these cards (i.e. should we even have the gp in, why
does the cg3 show up as a cg2 at boot time, are there switches we can set
on the cg3 to tell it what/how to emulate, etc).  Our main speed concern
is updating large images (ZPixmaps) in X11R4.

>From boot log..... 
Dec 11 mica vmunix: gpone0 at vme24d32 0x240000 
Dec 11 mica vmunix: gpone0: GP2 
Dec 11 mica vmunix: cgtwo0 at vme24d16 0x400000 vec 0xa8 
Dec 11 mica vmunix: cgtwo0: Sun-3 color board, double buffered, fast read

>From /dev ...
# ls -lt /dev/*cg* /dev/*fb* /dev/*gp*
crw-rw-rw-  1 root     staff     55,   0 Nov 14 15:52 /dev/cgthree0
crw-rw-rw-  1 root     staff     67,   0 Nov  5 15:22 /dev/cgsix0
crw-rw-rw-  1 root     staff     31,   0 Nov  5 15:22 /dev/cgtwo0
crw-rw-rw-  1 root     staff     68,   0 Nov  1 17:48 /dev/cgnine0
crw-rw-rw-  1 root     staff     32,   3 Nov  1 17:48 /dev/gpone0d
crw-rw-rw-  1 root     staff     32,   0 Nov  1 17:48 /dev/gpone0a
crw-rw-rw-  1 root     staff     32,   1 Nov  1 17:48 /dev/gpone0b
crw-rw-rw-  1 root     staff     32,   2 Nov  1 17:48 /dev/gpone0c
crw-rw-rw-  1 root     staff     22,   0 Nov  1 14:54 /dev/fb

Thanks, 
  Brad Hemminger
  bmh at rad.unc.edu