Date: Wed, 20 Sep 2000 12:10:53 +0200 From: Bjarne Blichfeldt <bbl@dk.damgaard.com> To: "Freebsd-Alpha (E-mail)" <freebsd-alpha@freebsd.org> Subject: Re: alpha ev56 contra ev67 Message-ID: <5ED89301AE60D311AAD500508B0EF55F50E072@dd-mail.intern.dd.dk>
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Thanks for your answers. Yes I did read the alpha manual before mailing, but I=20 obviously didn't got any wiser,=A0I am not into heavy cpu-ing ;-) Our current development platform is a ev56 and we produce code for that by default, but we also produce code for ev4 for=20 customers with older machines. The software is accounting software, and is mostly i/o, not processor heavy in any way. Now, one customer has upgraded his machine to a ev67 and is not impressed by the performance increase they have seen. They therefore request (thru Compaq) that we upgrade our machine, or borrow one from Compaq so we can compile our software on a ev67. Now there are about a zillion things to look into here, which has = nothing to do with the chips and I dont seriously believe that this customer's lack of expectation has much to do whith the chips, but... The ev5 had new instructions compared to ev4. That might had improved=20 performance, but only a recompile on a ev5 would have taken advantage of that. I could not find any instructions new to ev6, but understood there might be other issues, hence the question on the list. So while the case with this customer is probably not a processor problem, it triggered the thought process on wether or not it is time for us to upgrade our hardware. The downside of a newer processor is = that=20 we then have to produce both ev4 and ev56 in addition to the new = default=20 ev67 code. At least, that was the reasoning. Since there are no new instructions, we would be able to produce only ev4 and ev67 code, and then use ev67 code on a ev56 with no ill effect. So thanks again for your inputs. Regards, Bjarne Blichfeldt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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