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- From: bam@rudedog.asd.sgi.com (Brian McClendon)
- Newsgroups: comp.sys.sgi
- Subject: Re: How to speed up X?
- Message-ID: <1dcj1uINNgt5@fido.asd.sgi.com>
- Date: 6 Nov 92 01:50:54 GMT
- References: <1992Nov5.223141.8855@rd.hydro.on.ca>
- Organization: Silicon Graphics, Inc. Mountain View, CA
- Lines: 56
- NNTP-Posting-Host: rudedog.asd.sgi.com
-
-
- In article <1992Nov5.223141.8855@rd.hydro.on.ca>, twriter@rd.hydro.on.ca writes:
- > Recently, I acquired AutoCAD (R11) for an IRIS 4d/210 GTX running IRIX
- > 4.0.1. I mention AutoCAD only because certain aspects of its interface
- > highlight what I believe are deficiencies in SGI's X server. For
- > example, AutoCAD uses a crosshair for the mouse cursor, drawn with a
- > full height vertical line and a full width horizontal line. With AutoCAD
- > running and displaying locally (DISPLAY is :0.0), cursor movement is
- > unacceptably slow: when I move the mouse I can see both lines of the
- > crosshair being redrawn. However, if I display AutoCAD on my PC (using
- > XVision) cursor movement is near instantaneous.
- >
- > My questions: Why is SGI's X server slow compared with a PC based X
- > server? What can I do to speed it up?
- >
- > Thanks for your help.
- >
-
- The problem is that the particular platform you're running on was
- designed before we even thought about porting X to SGI. It's most
- likely and "RV1" GTX which does not do logic ops in hardware (so it
- must do readbacks a few pixels at a time for that crosshair cursor
- you're looking at). There is an X extension that AutoCAD could have
- used to get to the hardware crosshair cursor, but they chose not
- to use it. To give people an idea about X on SGI platforms,
- here's a sorted list of performance that is probably accurate +/- 2.
- (jsw, feel free to correct me here).
-
- 4D/20 - Personal Iris (w/ RE1 chip)
- 4D/70G - aka CLOVER1
- 4D/70GT - w/RV1 board
- 4D/210GTX - w/RV1 board
-
- 4D/70GT - w/RV2 board
- 4D/210GTX - w/RV2 board
- 4D/20 - PI w/RE2 chip (I don't believe 25 or TG makes much diff on the sort)
- 4D/420VGX/T
- Indigo R3000
- Indigo R3000 Elan (XS, XS24 don't make much difference on X performance (?))
-
- Crimson BLG
- Indigo R4000
- Crimson Elan
- Indigo R4000 Elan
- 4D/420 Reality Engine
- Crimson Reality Engine
-
-
- Note the first group was designed before we thought about X. The 2nd group
- has from somewhat to very respectable X performance.
-
- The final group is in a group of the fastest X servers in the industry
- _and_ ...
-
- To the best of my knowledge, Reality Engine has the fastest
- X performance in the world.
-