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Newsgroups: comp.sys.ibm.pc.hardware.chips
From: "Yousuf Khan" <bbb...@ezrs.com>
Date: Thu, 19 Aug 2004 19:56:38 GMT
Local: Thurs, Aug 19 2004 3:56 pm
Subject: Re: Here's a Dell story you don't see too often
alexi wrote: The examples in the Intel website certainly made no distinction between > Thanks Adam, yes, there is a concept of processor affinity, and > apparently some means to control the task. With this regard, Yousuf > is right. However, this mechanism is related to allocating logical > processors, not physical processors. physical or logical processors. In fact, as far as Intel is concerned, all of the processors are just logical processors. It's just that there would be two logical processors per physical processor. Intel's Hyperthreading mechanism makes allows for upto 256 logical processors in a physical processor (there's an 8-bit counter for logical processors). > As far as I remember, Nope, not random at all, it's all governed by the APIC specifications how > enumeration of physical processors (in x86 world) is > a random process. Different physical processors may have some > asymmetry in the way > they are hooked up in the system processors are enumerated. It may have been random prior to the advent of APIC, but now there's a specific enumeration order. Part of the spec is that the secondary logical processors are counted well after all of the primary logical processors have been counted. > (different configuration of Almost all operating systems have the ability to allocated certain tasks to > Hypertransport links for example), > therefore they may have different advantages and disadvantages with > regard to > different I/O-loaded tasks, while Win OS treats processors > symmetrically. certain processors or processor groups. Windows and most other OSes will simply allocate them round-robin by default, but there are administrative commands available to set the processor affinity. Therefore if there are administrative commands that can do it, then other programs should be able to access the same facilities. Yousuf Khan You must Sign in before you can post messages.
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