[RC5] Performance on P-IV

Ferry van Steen td at salesint.com
Fri May 11 11:18:37 EDT 2001


Now I'm confused... one says P-IV is 32IA other says it's 64IA I myself believe the Itanic (slang for Itanium) was to be the first 64IA. I'm gonna figure it out now and straighten everybody out :-)

Let ya all know in 30 mins or so
  ----- Original Message ----- 
  From: Dennis Lubert 
  To: rc5 at lists.distributed.net 
  Sent: Thursday, May 10, 2001 8:14 PM
  Subject: Re: [RC5] Performance on P-IV


  yeah the performance is really bad on PIV for *every* program running in IA32 mode. PIV native mode is IA64, nad since it is completely different from IA32 it emulates this via some integrated microcode. If u read benchmarks in some magazines like them from zd.net u will find that a PIV with same clock is significantly slower than a PIII. But if *one day* the IA64 core is supported it should run faster... should...

  At 11:31 10.05.01 +0200, you wrote:

    Hey I've got some sad sad sad statistics. I hope there is an explanation for this because else I have to advise everybody NOT to buy Pentium-IV's because this is sad.....
     
    Ok.. the distributed net does NOT recognize P-IV's yet so it does a micro bench and selects Core #2 RG Class 6 which is the same core running on P-II's. Knowing this you would suspect a performance increase on a P-IV 1400 compared to P-II 400 of 1400/400 = 3.5 which would mean 350% performance increase in MHz so the pure calculative power should increase 350% also... Ding WRONG.
     
    My P-II 400 on Core #2 RG Class 6 Win2K with some services runs 1,128,585,13 according to dnetc -benchmark rc5
    The P-IV 1400 (1.4GHz) running -benchmark rc5 Core #2 RG  Class 6 only makes a LOUSY 1,824,190,86 on a freshly installed WinME without any services.
     
    This is only a lousy 161.64% (182419086/112858513*100) increase over a 350% increase of MHz's
     
    To give another example
    (This runs on linux btw, and the tests I've done the rc5 clients run faster on linux in any case (using the exact same hardware RC5 goes faster under linux than under win)
    My AMD Athlon 1000 (1 GHz) scores a friggin' absolutely awesome 3,538,971.00 Hahaha a 1GHz Athlon is almost TWICE as fast as a stinking P-IV 1400 which has 400MHz more under ít's belt. This is scary shit... Hehe Guess I shouldn't buy intel... Atleast not until everything is optimized because this is really sad.
     
    Hope somebody can explain this....
     
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