Re: Scene stepping with DBASE process on CPU 0

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Steve Baker (sbaker++at++link.com)
Wed, 23 Sep 1998 08:56:16 -0500 (CDT)

On Wed, 23 Sep 1998, Mark Lewis wrote:

> My application is doing terrain paging in the DBASE process, and I have
> a problem in that if I place the DBASE on CPU 0 this causes severe scene
> stepping, whereas with the DBASE locked onto its own private CPU (other
> than 0) everything is fine.
  
Running stuff on CPU zero has always proved to be a bad idea for us.

IIRC, things like the video vertical retrace interrupt happen on zero -
and I guess that if you were delaying that from happening then there
would be an effect on APP somewhere in the pfSync/pfFrame area.

We *always* spec our machines with none of our own processes running
on CPU 0 - it seems to be the only way to guarantee realtime performance.

If you really *must* use CPU zero then be very careful to turn off
all unwanted UNIX operations. Use chkconfig - turn off stuff like
mediad that wakes up on some reagular interval and checks the CD-ROM
drive status.

Steve Baker (817)619-2657 (Vox/Vox-Mail)
Raytheon Systems Inc. (817)619-4028 (Fax)
Work: SBaker++at++link.com http://www.hti.com
Home: SJBaker1++at++airmail.net http://web2.airmail.net/sjbaker1

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