Справочник Пользователя для AMD 250
Chapter 5
Cache and Memory Optimizations
113
Software Optimization Guide for AMD64 Processors
25112
Rev. 3.06
September 2005
5.8
Write-combining
Optimization
❖
Operating-system, device-driver, and BIOS programmers should take advantage of the write-
combining capabilities of the AMD Athlon 64 and AMD Opteron processors.
For details, see Appendix B, “Implementation of Write-Combining.” For more information on write-
combining, see “Write-Combining” in Volume 2 of the AMD64 Architecture Programmer’s Manual
(order no. 24593).
combining, see “Write-Combining” in Volume 2 of the AMD64 Architecture Programmer’s Manual
(order no. 24593).
Application
This optimization applies to:
•
32-bit software
•
64-bit software
Rationale
In order to improve system performance, the AMD Athlon 64 and AMD Opteron processors
aggressively combine multiple memory-write cycles (of any data size) that address locations within a
64-byte cache-line-aligned write buffer.
aggressively combine multiple memory-write cycles (of any data size) that address locations within a
64-byte cache-line-aligned write buffer.