Date: Thu, 16 May 1996 21:28:15 +0300 (EET DST) From: Narvi <narvi@haldjas.folklore.ee> To: Terry Lambert <terry@lambert.org> Cc: "Serge A. Babkin" <babkin@hq.icb.chel.su>, hackers@FreeBSD.org Subject: Re: EDO & Memory latency Message-ID: <Pine.BSF.3.91.960516212452.25743G-100000@haldjas.folklore.ee> In-Reply-To: <199605161709.KAA17364@phaeton.artisoft.com>
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On Thu, 16 May 1996, Terry Lambert wrote: > > I have just tried lmbench and the numbers it gives are looking > > slightly strange for me. It shows memory latency upto 500ns while > > I have 60-ns EDO memory in a Pentium/75 box. Okay, its external > > clock is 25MHz, this gives 40ns, one wait state, it gives another 40ns, > > it gives 80ns, but why the overhead is over 400ns ? > > 25 * 3 = 75 > > Multiply access latency by 3. Contrary to what some prefer to think, Pentium 75 run on the external speed of 50 Mhz - 1.5*50=75. So how about looking the figures over once more time? > > Then multiply the whole deal by 100/60 because you probably didn't > set HZ to 100. > > > Terry Lambert > terry@lambert.org > --- > Any opinions in this posting are my own and not those of my present > or previous employers. > Sander .sigless on the moment
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