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07-05-2007
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| Vista x64 Ultimate SP2, Windows 7 Ultimate x64 | CPU L2 Cache Memory setting in Vista How to Set Vista for the CPU L2 Cache Memory Size |
My System Specs |
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07-13-2008
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| vista64 | Re: CPU L2 Cache Memory setting in Vista  Quote: Originally Posted by eXXXodus  Is there any way yet to change the L3 cache size? I have a 9850BE that has a 2MB L3 cache. Thanks. To my understanding, there really isn't a need to do so. In fact, there really isn't a need to edit the L2 cache size for most (all?) modern CPU's. Windows should successfully auto-detect these values. So, don't worry.  |
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07-14-2008
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| Ultimate X64 | Re: CPU L2 Cache Memory setting in Vista Quote: Originally Posted by ltwally Quote: Originally Posted by eXXXodus Is there any way yet to change the L3 cache size? I have a 9850BE that has a 2MB L3 cache. Thanks. To my understanding, there really isn't a need to do so. In fact, there really isn't a need to edit the L2 cache size for most (all?) modern CPU's. Windows should successfully auto-detect these values. So, don't worry.  |
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07-15-2008
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| vista64 | Re: CPU L2 Cache Memory setting in Vista Even still, your processor does not need the operating system to manage its cache; the processor does that for itself. This was only a concern for older processors. As an aside, the SecondLevelDataCache field truely is a relic of older processors. Read up on it here: Detailed Explanation of SecondLevelDataCache Quote (emphasis added by me): Quote: 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. |
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07-19-2008
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| Vista Ultimate x64 | Re: CPU L2 Cache Memory setting in Vista Well, then you mean doing this is futile with my using Q6600? I've already set the value to 1000(HEX).. if futile, should it be set to the default value, 0? |
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07-19-2008
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| Vista x64 Ultimate SP2, Windows 7 Ultimate x64 | Re: CPU L2 Cache Memory setting in Vista Hi Lonige, and welcome to Vista Forums. It's not futile. It's just that there is a very low chance that HAL will not detect the correct CPU L2 cache size for Vista. Setting this, just helps make sure that Vista uses the correct CPU L2 cache size, in case HAL fails for some reason, instead of only the default 256 KB size. That's all. Shawn |
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07-19-2008
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| vista64 | Re: CPU L2 Cache Memory setting in Vista According to Microsoft, this setting is only of value on systems with a direct-mapped L2 cache. This is not the type of cache used on processors since, apparently, the Pentium II. Unlike your system page-file, for instance, Windows (for the most) part has no say in what is in your processor cache. That is (almost) entirely up to the processor, itself. For more information, check out the wikipedia entry. |
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07-20-2008
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| Vista x64 Ultimate SP2, Windows 7 Ultimate x64 | Re: CPU L2 Cache Memory setting in Vista It makes you wonder why Microsoft would leave these registry settings in Vista then. I do not believe anyone uses a Pentium 2 or older with Vista. |
| My System Specs |
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07-20-2008
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| vista64 | Re: CPU L2 Cache Memory setting in Vista The Windows NT code-base goes back roughly 20 years... it's riddled with leftovers like this. Personally, I keep hoping the Microsoft will have the guts to do an "OSX" and re-invent the wheel... but that is neither here nor there. |
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07-23-2008
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| VISTA HOME PREMIUM X64/ 7 x64 / 7x86 | Re: CPU L2 Cache Memory setting in Vista Hi, You could just dot the Decimal option, enter the value given by performance monitor in step 5, E.G. 6144 then click Ok . Regedit will automatically enter both the Hex. value 0x00001800 for you, followed by the decimal value in brackets(6144) exactly as in step 8 . SIW2 LONDON |
| My System Specs |
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07-23-2008
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| vista64 | Re: CPU L2 Cache Memory setting in Vista Good idea. |
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