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DEVICE DRIVERS If a device is not working properly, then this has an effect on performance that is often catastrophic. You need to ensure that (in general) the latest device drivers are installed for all your devices. The exception is when a new device driver does not work as well as its predecessor, in which case you need to roll back to the old device driver. 4, "Managing Devices and Disks," discusses this topic in detail. POWER PLANS Power plans and configuring power settings are mentioned in the examination objectives covered in this chapter. However, 11, "BitLocker and Mobility Options," discusses these topics in depth, and there is no point duplicating that material here.
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Figure 13-46: Viewing performance diagnostic events in the Operational container Using Task Manager to Configure Processes Lesson 1 described how you use Task Manager to close failed applications and manage services. You can also use the tool to configure the processes that implement services. If a process is particularly significant and should be allocated more resources, you can set a higher priority for that process. If a process is using too many resources, or if the speed at which a process works is unimportant, you can assign it a lower priority and hence free resources for other processes. If your computer has more than one processor, you can configure the affinity of your processes to use a particular processor. By default, processes that install on a multiprocessor computer are set to use whatever processor is available. If an additional processor is added retrospectively to a computer, however, processes might require configuration so they can use that processor. For example, if Task Manager or Performance Monitor counters show that one processor on a dual-processor computer is heavily used and the other is not, you should change the affinity so resource-intensive processes use both processors. You also have the option of changing the affinity of some processes so that they use only the second processor.
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To determine what process or processes are used by a service, right-click the service in the Services tab of Task Manager and click Go To Process. This selects the Processes tab and highlights the relevant process. To change the priority of a process, right-click the process and click Set Priority. As shown in Figure 13-47, you can choose one of six priority levels. Do not select Realtime, though this could seriously affect the operation of other processes on your computer.
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Figure 13-47: Setting process priority in Task Manager To determine the affinity of a process and change it if necessary, right-click the process and click Set Affinity. You cannot change the affinity of certain system processes, and you cannot change affinity if the computer has only one processor. Otherwise, the Processor Affinity dialog box appears, as shown in Figure 13-48, and you can configure process affinity.
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Figure 13-48: The Processor Affinity dialog box Configuring Networking Performance Networking performance on an enterprise network depends upon a large number of factors, such as the type of Ethernet or wireless connections used, the speed of switches and routers, the number of devices on a network, and so on. However, in a small network, users tend to define networking performance by the speed of connection to other computers on the network (if they are transferring files) and the performance of their Internet connections. Configuring Internet Options can have a significant effect on networking performance and on computer performance in general. As an IT professional, you are aware that temporary Internet files can take up a considerable amount of disk space and should be deleted on a regular basis. You know that users with excessively large mailboxes can experience lengthy logon times, especially when they are own loading their profiles from a central server in the enterprise environment. These however, are matters that involve user training rather than configuration. The Internet Options dialog box offers configuration options that can affect networking performance. You can access this dialog box from Network And Internet on Control Panel or from your browser. On the General tab, you can delete temporary Internet files and other downloaded information such as Web form information. However, in the context of networking performance settings, the most significant tab in the dialog box is the Advanced tab, shown in Figure 13-49.
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Figure 13-49: The Internet Options Advanced tab The Advanced tab enables you to configure Accessibility, Browsing, International, Multimedia, Printing, and Security settings. Some of these have little or no impact on performance, whereas others can affect performance considerably. Typically, for example, Accessibility features would not be considered a performance issue, but if large font or caret browsing is set for a user that does not need them, then the perceived performance for that user is reduced. The Browsing settings can impinge on performance. For example, if you do not disable script debugging and display notifications about script errors, the user's browsing experience slows down. These settings are useful if you are debugging a new Web site that runs scripts but are inappropriate for the standard user. Even the simplest setting, such as choosing to always underline links, can slow browsing on a slow or heavily used site. If you are accessing sites that provide multimedia files for either streaming or downloading you can choose (for example) whether to play sounds and animations, automatically resize images, or use smart image dithering. In general effects that enhance the user's multimedia experience often also slow down site access and browsing. The more secure a site is, the slower it tends to be because of additional security checks. Typically, this is something you and your users need to accept. You should not reduce security merely to shorten access times. Nevertheless, it is probably not necessary to warn users whenever they browse from an HTTPS secure site to an insecure HTTP site.
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Windows Performance Analysis Tools The Windows Performance Toolkit (WPT) contains performance analysis tools that are new to the Windows SDK for Windows 7, Windows Server 2008, and Microsoft .NET Framework 3.5. WPT can be used by a range of IT Professionals including system administrators, network administrators, and application developers. The tools are designed for measuring and analyzing system and application performance on Windows Vista, Windows Server 2008, Windows Server 2008 R2, and Windows 7. Windows performance analysis tools analyze a wide range of performance problems including application start times, boot issues, deferred procedure calls (DPCs), interrupt service requests (ISRs), system responsiveness issues, application resource usage, and interrupt storms. These tools ship with the Microsoft Windows SDK for Windows Server 2008 and .NET Framework 3.5, which you can download at http://www.microsoft.com/downloads/details.aspx FamilyId=F26B1AA4-741A-433A-9BE5FA919850BDBF&displaylang=en (although it is probably easier to go to the Microsoft Download Center at http://www.microsoft.com/downloads and search for it). This SDK provides documentation, samples, header files, libraries, and tools to develop applications for Windows XP; Windows Server 2003; Windows Vista; Windows Server 2008; Windows Server 2008 R2; Windows 7; and .NET Framework versions 2.0, 3.0, and 3.5. You download and install the SDK in the practice later in this lesson. The WPT is released as an MSI installer (one per architecture) and contains the Performance Analyzer tool suite, consisting of the following tools:
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The Trace Capture, Processing, and Command-Line Analysis tool (Xperf.exe) This tool captures traces, processes them for use on a computer, and supports command-line (action-based) trace analysis. The Visual Trace Analysis tool (Xperfview.exe) This tool presents trace content in the form of interactive graphs and summary tables. The On/Off Transition Trace Capture tool (Xbootmgr.exe) This tool automates on/off state transitions and captures traces during these transitions.
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The Trace Capture, Processing, and Command-Line Analysis Tool Xperf.exe is a command-line tool that provides the following features:
Event Tracing for Windows (ETW) trace control ETW trace merging and enhancements by including other events Executable image and symbol identification Trace dump capabilities Support for post-processing
This tool manages the end-to-end operations that are needed to generate a trace file for analysis. You use Xperf.exe in the practice later in this lesson.
Xperf.exe enables events in the operating system by using groups and flags. These flags enable and disable events from providers in various parts of the operating system. For example, flags can direct the kernel, services, and applications to one or more trace files by using log sessions with custom configurations. You can then merge all traces into a single aggregate trace file that is referred to as a merged trace file. When Xperf generates this file, it collects additional information from the operating system and adds it to the aggregate trace. You can process the merged trace file on any supported operating system without reference to the system that generated the trace. You can then use Performance Analyzer (Xperfview.exe) to analyze the merged file, you can post-process the merged file into a text file, or you can use actions to do other types of processing. Actions produce summarized outputs that are specific to an area of interest, such as boot, shutdown, suspend, and resume operations, or to a type of system event, such as sampled profile, context switches, DPCs and ISRs, disk I/O, registry accesses, file accesses, or system configuration. The Visual Trace Analysis Tool The Visual Trace Analysis tool, or Performance Analyzer, is used to view the information from a single trace file generated by Xperf.exe. You can use the following command to start Performance Analyzer: xperf file.etl Xperf.exe forwards the file name to Performance Analyzer, which then opens and displays the data in the file. You can also run Performance Analyzer directly by entering xperfview in the Search box on the Start menu, the Run command box, or the command prompt. A Performance Analyzer trace is displayed in the practice later in this lesson. The On/Off Transition Trace Capture Tool Xbootmgr.exe collects information during the on/off transition phases of Windows 7. You can capture data during any of the following phases:
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