[15:04] !mtrr Memory Type Range Registers is a way for mainboard firmware to tell the operating system how to cache which ranges of physical memory. If your log says "mtrr_cleanup: can not find optimal value": http://web.archive.org/web/20190904223631/http://my-fuzzy-logic.de/blog/index.php?/archives/41-Solving-linux-MTRR-problems.html [15:13] !mtrr is Memory Type Range Registers (MTRR) is a way for a CPU to inform the operating system which ranges of physical memory should be cached by it, and how. If your log says "mtrr_cleanup: can not find optimal value": http://web.archive.org/web/20190904223631/http://my-fuzzy-logic.de/blog/index.php?/archives/41-Solving-linux-MTRR-problems.html