http://bugzilla.kernel.org/show_bug.cgi?id=11541
------- Comment #60 from v.ples...@gmail.com 2009-01-21 09:23 ------- Regarding MTRR: Memory Type Range Registers http://en.wikipedia.org/wiki/Mtrr Memory Type Range Registers (MTRRs) are a set of Processor Supplementary Capabilities control registers that provide system software with control of how accesses to memory ranges by the CPU are cached. It uses a set of programmable model-specific registers (MSRs) which are special registers provided by most modern CPUs. Possible access modes to memory ranges can be: * uncached * write-through * write-combining * write-protect * write-back . . . Successor Newer (primarily 64-bit) x86 CPU's support a more advanced technique called Page Attribute Tables that allow for per-table setting of these modes, instead of having a limited number of low-granularity registers to deal with modern memory sizes that can be as high as 8GB even on a laptop, and several times that amount on a desktop system. Details on how MTRRs work in detail are described in the processor manuals from CPU vendors. http://en.wikipedia.org/wiki/Page_Attribute_Table The Page Attribute Table (also known as Page Allocation Table) is a Processor Supplementary Capability extension to the page table format of certain x86 and x86-64 microprocessors. Like Memory Type Range Registers (MTRRs), they allow for fine-grained control over how areas of memory are cached. Unlike MTRRs, which provide the ability to manipulate the behavior of caching for a limited number of fixed physical address ranges, Page Attribute Tables allow for such behavior to be specified on a per-page basis, greatly increasing the ability of the operating system to select the most efficient behavior for any given task. -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword _______________________________________________ acpi-bugzilla mailing list acpi-bugzilla@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
