同樣的CPU及記憶體,為甚麼我的浮點運算會比你快
- 主題發起人 coolaler
- 開始日期
我在別的網站(某大p2p網站)看來的.. 至於跑測試是否有效就不知道了.
http://forum.shareget.com/showthread.php?t=111242
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[公告] 請不要再誤信修改L2參數發揮CPU效能，用來加速BT下載的速度
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很多人都誤傳修改L2參數發揮CPU效能，能加速BT下載的速度。其實這是錯誤的的，修改後可能會令你的系統會不穩定，尤其在使用BT時可能會影響下載的速度，在一些使用修改L2參數來用BT的用戶，發現真的會影響BT軟體的運行。我自己也把它取消後，與未取消比較，確是有平穩與不錯的下載速度。
原來這個修改L2參數是為了P2之前的CPU才能讓"direct-mapped L2 caches"能發揮效能而做的。在P2以後的版是沒有"direct-mapped L2 caches"，所以修改後會有不良影響。請看以下摘自微軟(Microsoft)發的文：(原文引至http://support.microsoft.com/defaul...kb;en-us;183063 )
MORE INFORMATION
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
SecondLevelDataCache records the size of the processor cache, also known as the secondary or L2 cache. If the value of this entry is 0, the system attempts to retrieve the L2 cache size from the Hardware Abstraction Layer (HAL) for the platform. If it fails, it uses a default L2 cache size of 256 KB. If the value of this entry is not 0, it uses this value as the L2 cache size. This entry is designed as a secondary source of cache size information for computers on which the HAL cannot detect the L2 cache.
This is not related to the hardware; it is only useful for computers with direct-mapped L2 caches. Pentium II and later processors do not have direct- mapped L2 caches. SecondLevelDataCache can increase performance by approximately 2 percent in certain cases for older computers with ample memory (more than 64 MB) by scattering physical pages better in the address space so there are not so many L2 cache collisions. Setting SecondLevelDataCache to 256 KB rather than 2 MB (when the computer has a 2 MB L2 cache) would probably have about a 0.4 percent performance penalty.
所以，在用P2以後的CPU就不要修改了！不要再誤信網路傳言，做個聰明的網路玩家。
http://forum.shareget.com/showthread.php?t=111242
=========================================================
[公告] 請不要再誤信修改L2參數發揮CPU效能，用來加速BT下載的速度
--------------------------------------------------------------------------------
很多人都誤傳修改L2參數發揮CPU效能，能加速BT下載的速度。其實這是錯誤的的，修改後可能會令你的系統會不穩定，尤其在使用BT時可能會影響下載的速度，在一些使用修改L2參數來用BT的用戶，發現真的會影響BT軟體的運行。我自己也把它取消後，與未取消比較，確是有平穩與不錯的下載速度。
原來這個修改L2參數是為了P2之前的CPU才能讓"direct-mapped L2 caches"能發揮效能而做的。在P2以後的版是沒有"direct-mapped L2 caches"，所以修改後會有不良影響。請看以下摘自微軟(Microsoft)發的文：(原文引至http://support.microsoft.com/defaul...kb;en-us;183063 )
MORE INFORMATION
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
SecondLevelDataCache records the size of the processor cache, also known as the secondary or L2 cache. If the value of this entry is 0, the system attempts to retrieve the L2 cache size from the Hardware Abstraction Layer (HAL) for the platform. If it fails, it uses a default L2 cache size of 256 KB. If the value of this entry is not 0, it uses this value as the L2 cache size. This entry is designed as a secondary source of cache size information for computers on which the HAL cannot detect the L2 cache.
This is not related to the hardware; it is only useful for computers with direct-mapped L2 caches. Pentium II and later processors do not have direct- mapped L2 caches. SecondLevelDataCache can increase performance by approximately 2 percent in certain cases for older computers with ample memory (more than 64 MB) by scattering physical pages better in the address space so there are not so many L2 cache collisions. Setting SecondLevelDataCache to 256 KB rather than 2 MB (when the computer has a 2 MB L2 cache) would probably have about a 0.4 percent performance penalty.
所以，在用P2以後的CPU就不要修改了！不要再誤信網路傳言，做個聰明的網路玩家。
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