Author: Terry McCracken
Date: 23:40:09 11/17/02
Go up one level in this thread
On November 18, 2002 at 02:10:50, Anthony Cozzie wrote: >On November 17, 2002 at 13:58:43, Vincent Diepeveen wrote: > >>Hello, >> >>If i read the below section of the intel programming guide very well, >>then i interpret that as: >> >> a) only the Xeon MP has hyperthreading and not the normal P4s, >> not even P4s sold as Northwoods. >> >> b) even the Xeon MP you should not assume that it supports hyper >> threading. In fact something that gets sold as Xeon MP you should >> still not assume that it supports hyper threading, but instead >> one must assume that only after specifically questionning the cpu >> whether it can do it. >> >>Intel IA-32 programming manual. Page 247 (of 780): >>" >>7.6.1 Implementation of Hyper-Threading Technology in IA-32 Processors >> >>Intel's Hyper-threading Technology was introduced into the IA-32 architecture >>in the Intel Xeon processor MP and in the later steppings of the Intel Xeon >>processor. Both of these processors implement Hyper-Threading Technology with 2 >>logical processors per physical processor. When reading the following sections >>(and other sections in this book that refer to this technology), assume that all >>references to the implementation of Hyper-Threading Technology in the Intel Xeon >>processor MP also apply to those later steppings of the Intel Xeon processor >>that implement Hyper-Threading Technology. >> >>Intel recommends that software not rely on IA-32 processor names to determine >>whether a processor supports Hyper-Threading Technology; but instead, it should >>use the CPUID instruction as described in Section 7.6.5, "Detecting >>Hyper-Threading Technology". >>" >> >>Vincent > > >All P4s have hyperthreading. You don't maintain "multiple build targets" for a >CPU, or any other ASIC for that matter :) However, most of them have it >disabled. > >anthony http://www.intel.com/homepage/land/hyperthreading_more.htm http://www.intel.com/support/platform/ht/os.htm http://www.intel.com/labs/htt/emerqa.htm http://www.intel.com/home/desktop/pentium4/index.htm http://www.intel.com/homepage/land/hyperthreading.htm?iid=ipp_dlc_procp4p+body_intro_ht& http://www.intel.com/eBusiness/products/server/processor/xeon/wp020901_sum.htm?iid=Homepage+htland_ebizxeon& I think there's a lot more going on then Vincent is willing to tell us;-) Oh and AMD needs to catch up!:o)
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