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经常听见有人说用windows 7玩网络游戏的时候网络延时比较高，也就是ping比平常 xp的时候高一点，一直找不到原因，很苦恼。今天我们终于找到理由了，原来是Win7的一个服务在作祟 ，这个服务叫：Multimedia Class Scheduler。
这个服务的官方解释是：
The Multimedia Class Scheduler service (MMCSS) enables multimedia applications to ensure that their time-sensitive processing receives prioritized access to CPU resources. This service enables multimedia applications to utilize as much of the CPU as possible without denying CPU resources to lower-priority applications.
MMCSS uses information stored in the registry to identify supported tasks and determine the relative priority of threads performing these tasks. Each thread that is performing work related to a particular task calls the AvSetMmMaxThreadCharacteristics or AvSetMmThreadCharacteristics function to inform MMCSS that it is working on that task.
For an example of a program that uses MMCSS, see Exclusive-Mode Streams
就是这个服务让我的PING如此高，问题是找到了，那么我们如何解决呢？很简单，禁用它就行了。
禁用方法：开始--运行-regedit，展开[HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Audiosrv]双击打开右侧的DependOnService项目，把MMCSS删除（千万别删到其他的），最后保存退出。
重启电脑后设置才会生效，然后到服务里关闭并禁用Multimedia Class Scheduler，再进游戏看看有没有提高呢。
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