Date: Wed, 24 Dec 2003 13:56:43 -0500 From: Chuck Swiger <cswiger@mac.com> To: Gerard Samuel <fbsd-questions@trini0.org> Cc: questions@freebsd.org Subject: Re: Running dual CPUs Message-ID: <3FE9E16B.8010203@mac.com> In-Reply-To: <200312240034.29237.fbsd-questions@trini0.org> References: <200312240034.29237.fbsd-questions@trini0.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Gerard Samuel wrote: > I acquired a pair of Slot 1 CPUs that is supposedly a matched pair. > I've heard, that they must be of the same stepping, and Im not sure of what Im > looking for. See page 12 of: ftp://download.intel.com/design/PentiumIII/specupdt/24445349.pdf ...which discusses this issue in detail: "Mixed Steppings in DP Systems Intel Corporation fully supports mixed steppings of Pentium III processors. The following list and processor matrix describes the requirements to support mixed steppings: • Mixed steppings are only supported with processors that have identical family and model number as indicated by the CPUID instruction. [ ... ] • In dual processor systems, the processor with the lowest feature-set, as determined by the CPUID Feature Bytes, must be the Bootstrap Processor (BSP). In the event of a tie in feature-set, the tie should be resolved by selecting the BSP as the processor with the lowest stepping as determined by the CPUID instruction. In the following processor matrix a number indicates that a known issue has been identified as listed in the table following the matrix. A dual processor system using mixed processor steppings must assure that errata are addressed appropriately for each processor." ...and then provides twenty pages worth of charts, notes, and whatnot. :-) [ If you get a chance, try to upgrade to Tualatin P3's, with the full-speed L2 cache and SSE. ] -- -Chuck
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3FE9E16B.8010203>