Intel处理器电源管理概述PPT，推荐阅读。 •Introduction • Overview of all power states Ø Global States Ø Device States Ø CPU States Ø PCIe Link PM States Ø Sleep States Ø AMT States 点击下载
READ MORE »Posts in category CPU基础
[转]CPU C-States Power Saving Modes
![[转]CPU C-States Power Saving Modes](http://ilinuxkernel.com/wp-content/uploads/2011/06/061811_1646_CPUCStates11.gif)
Everything You Need to Know About the CPU C-States Power Saving Modes http://www.hardwaresecrets.com/article/Everything-You-Need-to-Know-About-the-CPU-C-States-Power-Saving-Modes/611/1 Introduction In order to save energy when the CPU is idle, the CPU can be commanded to enter a low-power mode. Each CPU has several power modes and they are collectively called “C-states” or “C-modes”. In this tutorial we will […]
READ MORE »x86/x86_64 CPU中PCI Express扩展配置空间访问
PCI Express配置空间 PCI-E是用来互联如计算和通信平台应用中外围设备的第三代高性能I/O总线。PCI-E采用了与PCI相同的使用模型和读写（load-store）通信模型，支持各种常见的事务，如存储器读/写、IO读/写和配置读/写事务。其存储器、IO和配置地址空间与PCI的地址空间相同。PCI Express与PCI系统是软件向后兼容的。
READ MORE »Intel Nehalem服务器中物理内存地址分布
Nehalem架构中系统内存地址空间如下。共有三个基本内存地址区域： （1）低于1MB； （2）1MB~4GB； （3）高于4GB。 TOLM: Top of Low Memory CSR: Control and Status Register
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