超线程将在Nehalem身上重生

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Hillsboro (OR)-AMD打算推出第一款基于BARCELONA核心的4核OPTERON处理器,同时INTEL对于BARCELONA核心的回应是:公司正打算上马45NM制程的服务器和桌面处理器以及2008年在NEHALEM核心复活超线程技术.该报道指出INTEL已经承认了AMD声称的AMD所开发的才是真正的4核心处理器,而INTEL所谓的45NM制程的PENRYN 4核心处理器是基于两个双核打包起来的.尽管如此,INTEL也指出AMD将内存控制器结合进CPU的做法会有不利的因素而且会强迫生产商在缓存大小上作出让步同时只支持双通道.

Hillsboro (OR) - AMD is preparing the rollout of its first quad-core processor, an Opteron processor based on the Barcelona core. Meanwhile, Intel is developing an answer to Barcelona: The company is lining up 45 nm server and desktop processors and will revive Hyperthreading in 2008 with the Nehalem core.

Sources indicated that Intel acknowledges AMD's claim that the company has developed a "true" quad-core processor, while Intel is relying on a dual-die package with two dual-core processors at this time as well as 45 nm Penryn quad-core CPUs. However, the company also believes that AMD's decision to integrate the memory controller into the CPU has a downside and forces the manufacturer to compromise cache size and stick to only two memory channels.

Intels' initial answer to AMD's Barcelona quad-core will be the "Harpertown" processor for servers and "Yorkfield" for desktop PCs. Both chips will be based on a 45 nm shrink of the current Core architecture and continue to use a multi-chip-package for quad-core CPUs. Intel claims that the multi-chip package provides a flexibility that "enables Intel chip designers to put two cores in one package, which AMD can't do in such a straightforward way," sources indicated.

INTEL最初对AMD的BARCELONA 4核心的回应是认为应该和自己的HARPERTOWN核心的服务器级别产品和YORKFIELD核心的桌面级产品是相当的.两种芯片组都是基于以减少目前核心结构为目的的45NM制程,而且可以在4核处理中继续使用多芯片组.INTEL指出使用多芯片组可以提供灵活性使得INTEL的芯片设计师们可以将两个核心结合在一起,AMD是没有办法使用这种简便的方法的.

Things will get a bit more interesting with the introduction of the Nehalem core - an evolutionary step up from the Core microarchiteture. Sources said that the Nehalem architecture will result in performance gains in the range between 20 and 40%. The architectural changes in Nehalem will bring new instructions as well as a new shared cache, which, according to sources, will grow to 12 MB. Intel will also revive its Hyperthreading technology, which will be called "symmetric multi-threading" (SMT).It basically represents a multi-core adaption of the original Hyperthreading idea that was first introduced with single-core Pentium 4 processors in 2002.

对于NEHALEM核心的介绍更能引起别人的兴趣――CPU核心微结构设计具有发展意义的一个阶段.有资料指出NEHALEM核心的微结构设计可以获得20%-40%的性能提升.NEHALEM微结构设计的改变可以带来一些新的CPU指令系统,比如一种新的高达12MB的共享缓存.INTEL复活的超线程技术被称做对称多线程技术(SMT: symmetric multi-threading).从根本上体现出了一个多核心处理器所使用的这种技术和在2002年的单核P4处理器上面首次提出的最原始的超线程思想是相一致的

Hyperthreading originally simulated a second virtual core within a physical core CPU and was the first step to take advantage of multi-threaded applications on the desktop. In the 45 nm market, this technology would simulate four additional threads in quad-core processors and eight additional threads in eight-core processors (for a total of 16), which are expected to debut in the 45 nm generation of Intel processors.

超线程最初是在一个实际的CPU上面模拟一个虚拟的CPU.超线程技术在桌面系统的多应用程序应用的表现中相比单核CPU首次体现出了优势.在45NM制程的市场中,这种技术可以在4核CPU中另外模拟4个的线程,在8核CPU中另外模拟8个线程(总共16个线程).这种技术希望能在INTEL 45NM制程的处理器中首次露面.

翻译不是很好,望见谅.
http://www.tgdaily.com/2007/02/13/amd_intel/