Vista performance analysis: Get boot performance data using xperf

xbootmgr.exe -trace boot
 After entering this command, xbootmgr will automatically restart the system, and then start collecting relevant startup information. data. After the reboot is complete, xbootmgr will wait for the explorer to start all, and generate a log file (extension: etl) to the xperf installation directory. Below we need to analyze this file. There are many ways to analyze the process. The easiest way is to enter the command line mode and switch to the xperf installation directory. Enter: 
xperf -i boot_BASE+CSWITCH_1.etl -o boot.xml -a boot
Command automatically Analyze and then output an xml report file.  Below I am going to talk about a more detailed analysis process. 
 1. Open the etl file: Using the xperfview boot_BASE+CSWITCH_1.etl command, the xperfview tool is called to perform a detailed parsing of the etl file. The etl file is xperf's original performance data file, which records all the collected data. 2.xperfview After parsing is completed, you will see a picture similar to the following: 

Find the process lifetimes category (above), you will find the first user state process smss in the system when it is more than 50 seconds. The .exe is started (process ID: 748) and the previous time is spent on system. In other words, the various drivers running in kernel mode, including the Windows kernel and the executable, took more than 50 seconds to complete the initialization before the startup subsystem, which took too long. 3. Since it took more than 50 seconds to initialize the Windows kernel and the executable, this is very abnormal, because we need to look at the details in these 50 seconds. In Disk Utilization by process, select the time period of 0-50 seconds: