Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!swrinde!ucsd!ncr-sd!palomar!dougm From: dougm@palomar.SanDiego.NCR.COM (Doug Marshall) Newsgroups: comp.sys.ibm.pc Subject: Re: Can I Trust Performance Results? Message-ID: <1914@ncr-sd.SanDiego.NCR.COM> Date: 18 Oct 89 04:45:43 GMT References: <3931.253b0031@uwovax.uwo.ca> Sender: news@ncr-sd.SanDiego.NCR.COM Reply-To: dougm@palomar.SanDiego.NCR.COM (Doug Marshall) Organization: NCR Corporation, Rancho Bernardo Lines: 18 In article <3931.253b0031@uwovax.uwo.ca> les@uwovax.uwo.ca writes: > > I have a 286 clone with a 80286-10 processor running at a clock speed of >12MHz. Running the Landmark Speed Test indicates that its equivalent to a >IBM AT running at 16MHz! Why? How does it get the extra thoughput, or can >a processor 'fool' a performance tester? > From what I understand, it has to do with the number of wait states of your memory. I venture to guess that you have 100ns chips installed and also have 0 wait states. This means (I think) that data is available without waiting an additional cycle for setup to occur. A guess on my part is that the standard bus definition has one wait state for memory accesses. That's my opinion, for what it's worth. ---- Doug Marshall +1 619 485 3494 <...!ncr-sd!palomar!dougm> "All of us is smarter than each of us!"