The kernel memory dump file includes contents of memory allocated to the Executive, Kernel, Hardware Abstraction Layer (HAL), and file system cache, in addition to nonpaged pool memory allocated to kernel-mode drivers and other kernel-mode routines. The kernel memory dump file records only kernel memory contents and its size varies (several megabytes) but it is always less than the size of the system memory. Also, it takes longer to create than a small dump file and this increases the downtime associated with a system failure.
Windows 7 has a number of performance parameters that allows you to adjust visual effects or specify whether the system is adjusted for best performance of applications or background services. From the Performance Options snap-in you can configure the virtual memory (page file) settings and Data Execution Prevention (DEP). To access these parameters from Control Panel\All Control Panel Items\Performance Information and Tools\Advanced Tools click Adjust the appearance and performance of Windows. Otherwise, you can type Performance Options in the Start search text box, click Performance Information and Tools, click Advanced tools and finally click Adjust the appearance and performance of Windows.