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WinXP修改CPU二级缓存是否能提速验证

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　　曾经网络上一直流行一个WinXP的优化技巧，就是打开CPU二级缓存，这样就能发挥出CPU的最大效率，这个观点甚至得到了使用率最高的“Windows 优化大师”的支持，在使用Windows 优化大师我们可以看到它的优化设置栏中就有优化CPU二级缓存的选项。但是这个优化技巧真的能加速WinXP运行速度吗?下面我们就针对这个问题展开详细解答。

　　推荐：最新Win7下载

　　首先我们需要知道这个优化技巧的操作步骤：

　　WinXP系统中，默认状态下CPU二级缓存并未打开。为了提高系统性能，我们可以通过修改注册表，或使用“Windows优化大师”等软件来开启它。

　　手动打开方法：运行注册表编辑器，展开HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Memory Management分支，双击右侧窗口中的“SecondLevelDataCace”，然后在弹出的窗口中直接填入当前计算机所使用的CPU的二级缓存容量即可。

　　用Windows优化大师打开方法：启动Windows优化大师，选择“系统性能优化”，在“文件系统优化”中，最上面就是关于CPU二级缓存的设置项。拖动滑块到相应的位置后，保存设置并重新启动计算机即可。

　　打开CPU二级缓存真的能加速WinXP运行速度吗?

　　在微软的知识库中我们找到了如下内容：“HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management”中的SecondLevelDataCache键的值只有在Windows XP系统从硬件抽象层(Hardware Abstraction Layer )读取CPU二级缓存(L2)失败时才会读取SecondLevelDataCache键的数据。而且SecondLevelDataCache键值=0的意义是二级缓存为256KB。

　　在一篇知识库文章中我们还找到了“Do not change the SecondLevelDataCache entry ”这样的话，在文章中指出一些第三方资料宣称修改SecondLevelDataCache键的值可以提高系统性能是不正确的。二级缓存的数值是由操作系统检测并且完全不受SecondLevelDataCache值的影响。

　　从微软知识库的文章中我们可以看到，所谓的Windows XP系统需要用户手动打开二级缓存这种说法是错误的。Windows XP系统是根据硬件抽象层读取CPU的二级缓存数值。只有在读取失败时才会读取SecondLevelDataCache的值，而且SecondLevelDataCache的默认数值0所代表的意义就是二级缓存为256KB，而不是表示关闭。

　　通过上述的操作体验和知识库内容的结合，我们能发现无论你怎么修改WinXP的CPU二级缓存，它都是一直开启的，因此用户没有必要特地的去进行修改操作，修改之后也并不能真正起到加速系统运行的作用。可见这一网络上流传的所谓WinXP优化技巧是不正确的。

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