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- Newsgroups: comp.sys.sgi
- Path: sparky!uunet!ukma!usenet.ins.cwru.edu!agate!stanford.edu!microunity!jsw
- From: jsw@microunity.com (Jeff Weinstein)
- Subject: Re: How to speed up X?
- Message-ID: <1992Nov6.014054.24424@microunity.com>
- Keywords: X Xsgi
- Sender: usenet@microunity.com (news)
- Nntp-Posting-Host: rgb.microunity.com
- Organization: MicroUnity Systems Engineering, Inc.
- References: <1992Nov5.223141.8855@rd.hydro.on.ca>
- Date: Fri, 6 Nov 1992 01:40:54 GMT
- Lines: 31
-
- In article <1992Nov5.223141.8855@rd.hydro.on.ca>, twriter@rd.hydro.on.ca (Timothy Writer) 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?
-
- I expect that the problem is the hardware, not the X server. Older SGI
- machines don't do ALUs other than GXcopy in hardware, so they have to be
- emulated in software. I suspect that is what autocad is doing. Newer
- systems like any Indigo, VGX, and Reality Engine were all designed with
- some input from X server developers, so they have the necessary features
- to effectively support X. If you had one of these newer systems I would
- expect that you would not see the problem you described. As far as I know
- autocad for SGI machines was mostly developed on/for indigo, so I don't
- think that much thought was put into making the X driver work well with
- older SGI machines.
-
- As I understand it autocad for IRIX comes with a GL driver as well as
- the default X driver. I would start by using that.
-
- --Jeff
-
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-