The !chklowmem extension determines whether physical memory pages below 4 GB are filled with the required fill pattern on a computer that was booted with the /pae and /nolowmem options.



Windows 2000


Windows XP and later



This extension is useful when you are verifying that kernel-mode drivers operate properly with physical memory above the 4 GB boundary. Typically, drivers fail by truncating a physical address to 32 bits and then in writing below the 4 GB boundary. The !chklowmem extension will detect any writes below the 4 GB boundary.