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- From: rskinner@mipos2.intel.com (Rod Skinner)
- Newsgroups: comp.sys.intel
- Subject: Re: Performance of Intel 80x86 CPUs in UNIX environment (repost)
- Message-ID: <BxGI1w.Go@inews.Intel.COM>
- Date: 9 Nov 92 16:05:55 GMT
- References: <1d3ut0INNdnc@iraul1.ira.uka.de> <1992Nov3.041557.20712@ntuix.ntu.ac.sg> <TMH.92Nov7193313@bigfoot.first.gmd.de>
- Sender: news@inews.Intel.COM (USENET News System)
- Organization: Intel Corporation, Santa Clara, CA USA
- Lines: 55
- Nntp-Posting-Host: mipos2
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- In article <TMH.92Nov7193313@bigfoot.first.gmd.de> tmh@bigfoot.first.gmd.de (Thomas Hoberg) writes:
- >In article <1992Nov3.041557.20712@ntuix.ntu.ac.sg> eoahmad@ntuix.ntu.ac.sg (Othman Ahmad) writes:
- > SPEC benchmark is no longer a typical user program. My main load now is
- > the running of X-window applications. Anyone has figures for X11 running on
- > Intel Microprocessors?
- >
- > I only try it on our 386/25(no cache) and 486/33. The figure for
- > X11perf -bigtilerect500
- > is about 2 versus 4.4 per second. The speedup is only 120% which shows that
- > the internal cache effect becomes negligible.
- > Even then x11perf is a repetition benchmark which can make available
- > cache look more impressive than it should be.
- >Be very careful when using Xperf as a benchmark on an ISA based system.
- >You might end up measureing ISA throughput and unsurprising there is
- >little difference there. To get some useful numbers you should use the
- >pixmap/pixmap values and no window/window or pixmap/window
- >window/pixmap values (although they might be interesting in an other
- >context). Actually I'd be very interested to see those values for
- >otherwise identical systems using the various DX, DX2 processors from
- >25 to 60MHz.
-
- I would suspect that the QUALITY of the GRAPHICS board would have even
- a larger impact on performance than the ISA bus bandwidth. Can you
- describe the GRAPHIC subsystem in the two machines that you used to
- get your CPU ratios? The CPU only can speed up that portion of the
- execution time it controls. When you configure a system with a
- bottleneck that consumes large portions of the execution time the
- processor cannot scale that fixed time with CPU performance improvement.
-
- The Intel definition of a 80486DX processor includes the performance
- improvement of 2x of a DX-25 over a 80386DX-33. This holds true
- for Intel processors on all benchmarks when the computer system disk,
- memory, and graphics systems are properly configured. Slow down anyone
- of those three to where they begin to limit user performance and there
- is no reason to buy faster CPUs.
-
- rod
-
- > --
- > Othman bin Ahmad, School of EEE,
- > Nanyang Technological University, Singapore 2263.
- > Internet Email: eoahmad@ntuix.ntu.ac.sg
- > Bitnet Email: eoahmad@ntuvax.bitnet
- >---
- >Thomas M. Hoberg | Internet: tmh@first.gmd.de
- >1000 Berlin 41 | tmh@cs.tu-berlin.de
- >Wielandstr. 4 |
- >Germany | BITNET: tmh@tub.bitnet
- >+49-30-851-50-21 |
-
-
- Rod Skinner I speak for myself only.
- Intel Corp
- 3065 Bowers Avenue MS NW1-20 PH (408) 765-4474
- Santa Clara, CA 95052 FAX (408) 765-4920
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