[10520] in Athena Bugs
RS/6000 GTO X server slowness
daemon@ATHENA.MIT.EDU (John Carr)
Sun May 30 17:35:34 1993
To: bugs@Athena.MIT.EDU
Cc: phils@Athena.MIT.EDU
Date: Sun, 30 May 1993 17:35:28 EDT
From: John Carr <jfc@Athena.MIT.EDU>
Using epoch (a variant of GNU emacs) on an RS/6000 with a GTO display
("hispd3d : 7235 POWER GTO") the window is drawn very slowly (about 20 lines
per second) if it is unobscured. I work around this problem by putting a
small window on top of one corner of the editor window. This makes it draw
at the speed one would expect on a modern workstation. I found by covering
epoch with different shaped and sized windows that epoch always redraws
slowly if the exposed region is a rectangle.
emacs 18.58 does not have this problem.
epoch draws lines using this sequence of requests:
clear area
set clip rectangles
poly fill rectangles
poly text 8
emacs uses image text 8 and does not set clip rectangles or explicitly clear
the area.
Please report this to IBM.
