Javier Castellar (javier++at++sixty.asd.sgi.com)
Fri, 24 Jan 1997 22:16:28 -0800
Speaking in general terms, all the imediate mode performance has been
greatly increased due the new bandwidth host - Gfx, although the internal
graphics pipeline architecture/speeds is nearly identical.
If your application was host limited (bandwidth in/out the pipe), CPU
limited (processing of the delivery for OpenGL calls) or if you performed large
pixel transfers (glDrawPixels/glReadPixels) - texture paging then Onyx2 IR
should boost your application.
I don't know which numbers we have been published but I have seen over
337 MB/s (glDrawPixels) on Onyx2 IR for 1kx1k about four weeks ago. I think
that this is also the number for texture paging. On Onyx (1) it was 180MB/s,
now it is over 300MB/s, in fact I think that the latest number is probably 340
MB/s.
Off course if your texture transfers were very small (set up limited)
then you might not see so huge numbers.
Also on the CPU side, I have seen very impressive improvements, since
very few applications fit on any secundary CPU cache (now 4MB); therefore the
new amazing bandwidth in/out main memory (independent of the number of CPUs
!!!!) helps a lot.
Regarding hardware display list mode, you will see the same performance
that before if you where using the display list memory cache in IR. (!!!).
Regards.
-Javier
On Jan 24, 9:28am, Ken Sakai wrote:
> Subject: ONYX2 and graphics performance.
>
> Fellow Performers,
>
> We are in the process of upgrading our "old" ONYX RE2 to InfiniteReality
> graphics. One option is to retrofit the IR graphics subsytem with 2-RM6-64
> with R10000's replacing our R4400's, The other, significantly more
> expensive option is to get a totally new ONYX2 IR system and surplus our
> "old" ONYX to another project. The question that I have is just how much
> of a performance increase graphics-wise will the ONYX2 system have over the
> upgraded ONYX system? Will the lack of ONYX2 XBOW for instance greatly
> limit my texture loading rates for instance? Just how much does the ONYX2
> architecture do for graphics? I would be grateful for any inputs.
>
> Thanks,
>
> Kenneth N. Sakai Lockheed Martin Missiles & Space
> Research Specialist/3-D Computer Graphics P.O. Box 3504
> Email: sakai++at++lmsc.lockheed.com Sunnyvale, CA 94088-3504
> Phone: (408) 756-0682
>
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>-- End of excerpt from Ken Sakai
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