From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,LOTS_OF_MONEY autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,bc1361a952ec75ca X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2001-08-27 11:09:12 PST Path: archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!newsfeed.berkeley.edu!ucberkeley!enews.sgi.com!coop.net!newsfeed1.global.lmco.com!svlnews.lmms.lmco.com!news1.lmtas.lmco.com!not-for-mail From: Gary Scott Newsgroups: comp.lang.ada Subject: Re: simple CPUs, was Re: How Ada could have prevented the Red Code distributed denial of service attack. Date: Mon, 27 Aug 2001 09:44:14 -0500 Organization: LM Aeronautics Message-ID: <3B8A5CBE.CA62B5CD@lmtas.lmco.com> References: <9lr3tt$4gr$1@nh.pace.co.uk> <9mdjbu$qri$1@nh.pace.co.uk> NNTP-Posting-Host: CAA261517.lmtas.lmco.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 4.72 [en]C-CCK-MCD {C-UDP; LMTAS} (WinNT; U) X-Accept-Language: en,pdf Xref: archiver1.google.com comp.lang.ada:12473 Date: 2001-08-27T09:44:14-05:00 List-Id: Hi, Marin David Condic wrote: > > But your point is taken - with many modern processors you could probably > eliminate the cache and pipelining and maybe do some other things to create > a more predictable (yet slower) device and still be coming out ahead. (I bel > ieve this was the idea behind the RH-32) The problem is that there aren't a > lot of silicon foundaries willing to make you a RAD-hard, custom version of > their chip (with all the required testing and certification) when the number > of chips you want to buy is measured in the hundreds. We very frequently have to buy out the remaining stock of parts to insure sufficient supply to meet known needs. We recently tried to buy some parts in the 20 piece range and were required to place a minimum 200 piece order (not in itself a bad thing to have plenty of spares, but a little excessive in this case). They wouldn't produce them for a lesser quantity order. When you create products with 30 year life spans, it's a considerable problem. But we now use whiz bang design software to develop rapid prototype parts (e.g. ASICs) and PCBs that provide form-fit replacements with identical functionality using currently available parts. > > MDC > -- > Marin David Condic > Senior Software Engineer > Pace Micro Technology Americas www.pacemicro.com > Enabling the digital revolution > e-Mail: marin.condic@pacemicro.com > Web: http://www.mcondic.com/ > > wrote in message > news:sGhi7.17722$sa.8914739@news1.rdc1.sfba.home.com... > > >If Intel did offer some version of their 80x86 family in a deep-space, > > >... > > >One of the beauties of the 1750a was the indivisible nature > > >of the instructions, their simplicity and predictability. For > hard-realtime > > I wonder how much performance loss there would be if you eliminated > > all the fancy pipelining etc etc from a Pentium IV, in order to simplify > > timing estimates? As much as 1/2? Continue to run at 1GHz, of course.