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To: Elmer who wrote (169743)	8/22/2002 1:55:12 AM
From: Dan3	Respond to of 186894

Re: dual 1GHz Pentium III server delivers results that are 34 percent slower than our 2GHz Xeon test bed with hyperthreading disabled LOL!!! CPU intensive server apps generally scale with CPU frequency. P4 has truly terrible IPC! And, that article is from last February - What happened to Intel's SMT? It would seem that SMT still isn't stable, and a little data corruption goes a long way when it comes to servers. By the way, that same testing software concludes that Windows 2000 runs applications up to 250% faster, on identical hardware, than Windows XP... That sure hasn't been my experience! It's also neat to see that a P4 1.5ghz chip can barely edge out a PIII 733mhz chip in some applications, while dual PIII 1ghz chips soundly thrash dual P4 1.5ghz chips. infoworld.com Thanks for that walk down memory lane.

To: Elmer who wrote (169743)	8/22/2002 2:13:44 AM
From: Joe NYC	Read Replies (1) \| Respond to of 186894

Elmer, Our tests of a hyperthreading-enabled Intel Xeon DP server showed, on average, a 45.71 percent increase in SQL transaction performance and a 31.13 percent increase in three-tier Web application performance, versus the same system with hyperthreading disabled[a P4]." Anand is showing different results of gains (losses) from hyperthreading: 2.4x2 2.2x2 2.2x1 Website Database Performance: +4.3% +3.7% +12.4% Ad Database Performance: -3.0% -5.5% +1.5% Forums Database Performance -0.3% +17.0% +9.2% Nowhere near the Infoworld numbers, and highly unpredictable, whether Hyperthreading will help or hurt. I think only one conclusion can be drawn from the real test that I have seen: Hyperthreading helps in single processor servers processing server tasks. In single CPU machines on client apps / games etc and in multiprocessor servers on server apps, the results are unpredictable, just as likely hurting performance as helping. Joe