Re: RAM shows less

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On 05/10/2010 04:10 PM, Bill Davidsen wrote:
> Jatin K wrote:
>   
>> On Monday 10 May 2010 08:29 PM, Bill Davidsen wrote:
>>     
>>> Jatin K wrote:
>>>    
>>>       
>>>> Dear All
>>>>
>>>> I've a new Dell Inspiton 1564 laptop with 1GB graphics card and 4GB DDR3
>>>> RAM, FC 12 64bit installed on it , but in system information tab it
>>>> shows 3.7GB usable RAM. My Question is "what about the remaining RAM ??"
>>>> is it shared with graphics card ? then what is the meaning of dedicated
>>>> RAM of my graphics card ( if graphics card shares my installed ram module )
>>>>
>>>> any idea ??
>>>>
>>>>      
>>>>         
>>> Look at the start of /var/log/messages, /proc/mtrr, etc. See if your CPU has PAT
>>> capability, etc.
>>>
>>>    
>>>       
>> Thnx Bill
>>
>> My processor is Intel i5 430 2.27Ghz  ( turbo boost up to 2.53Ghz)
>>
>> and following is the output of  cat /proc/mtrr
>> ---------------------------------------------------------------------------------------
>> reg00: base=0x0ffe00000 ( 4094MB), size=    2MB, count=1: write-protect
>> reg01: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
>> reg02: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
>> reg03: base=0x100000000 ( 4096MB), size= 1024MB, count=1: write-back
>> reg04: base=0x138000000 ( 4992MB), size=  128MB, count=1: uncachable
>> -----------------------------------------------------------------------------------------
>>
>> can you have a look at it ..?    is it explaining  something ?????
>>
>>     
> It may explain, note that you have 3GB starting at zero, a hole, and 1GB 
> starting at 4GB. I'm surprised that the system did that well considering you 
> have 2x2GB DIMMs.
>
> There are two more things you can look at, /proc/meminfo will show what the 
> system views as usable memory, and the output of dmidecode will show tons of 
> stuff, but there will be one info block per DIMM which shows information on just 
> that DIMM. I suspect you are getting a few MB of RAM shared for video, or 
> something like that. The information in /var/log/messages will give more detail 
> about how the memory is being allocated, but it's unlikely to lead to recovering 
> more useful space.
>
> At least you have learned a lot about looking at your system, score one more for 
> "things I learned while looking for something else."
>
>   
Another thing you can do is check your BIOS. There is a setting where
you can set up some parameters. This would probably be in the advanced
chipset features.

-- 
Jerry Feldman <gaf@xxxxxxx>
Boston Linux and Unix
PGP key id: 537C5846
PGP Key fingerprint: 3D1B 8377 A3C0 A5F2 ECBB  CA3B 4607 4319 537C 5846


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