Aqui les pongo la verdad de ese mal llamado "truco"
Detailed Explanation of SecondLevelDataCache
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Article ID : 183063
Last Review : June 11, 2002
Revision : 1.0
This article was previously published under Q183063
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 (
http://support.microsoft.com/kb/256986/EN-US/) Description of the Microsoft Windows Registry
SUMMARY
This article discusses the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager \Memory Management\SecondLevelDataCache
REG_DWORD Range: Kilobytes 0, 1 -cache size Default: 0 (256K)
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.
Sacado de la propia mocosoft:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q183063
En resumen, eso no funciona para ningun cpu superior al pentium I, en cualquier sistema moderno la cache de nivel 2 es autoreconocida por el S.O. y ese valor del registro queda en cero simplemente por que no se necesito usarlo para definir el tamaño de la cache