Real and available memory?

[Krassimir Slavchev]

John Baldwin wrote:
> On Wednesday 09 August 2006 06:13, Krassimir Slavchev wrote:
>   
>> Julian Stacey wrote:
>>     
>>> Reference:
>>>   
>>>       
>>>> From:		Krassimir Slavchev <krassi at bulinfo.net> 
>>>> Date:		Wed, 09 Aug 2006 11:46:33 +0300 
>>>> Message-id:	<44D9A0E9.30608 at bulinfo.net> 
>>>>     
>>>>         
>>> Krassimir Slavchev wrote:
>>>   
>>>       
>>>> Julian H. Stacey wrote:
>>>>     
>>>>         
>>>>> Krassimir Slavchev wrote:
>>>>>   
>>>>>       
>>>>>           
>>>>>> Julian H. Stacey wrote:
>>>>>>     
>>>>>>         
>>>>>>             
>>>>>>> Krassimir Slavchev wrote:
>>>>>>>   
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> I have Vortex86-6082 with 128Mb AMI bios.
>>>>>>>>
>>>>>>>> Why the kernel reports only 80 MB available memory?
>>>>>>>> Is this related to BIOS or kernel settings?
>>>>>>>>
>>>>>>>> dmesg output:
>>>>>>>>
>>>>>>>> Copyright (c) 1992-2006 The FreeBSD Project.
>>>>>>>> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
>>>>>>>>         The Regents of the University of California. All rights reserved.
>>>>>>>> FreeBSD 6.1-STABLE #0: Wed Jul 26 10:09:06 EEST 2006
>>>>>>>>     root at krassi:/usr/obj/usr/src/sys/TINYBSD
>>>>>>>> Timecounter "i8254" frequency 1193182 Hz quality 0
>>>>>>>> CPU: Pentium (166.61-MHz 586-class CPU)
>>>>>>>>   Origin = "SiS SiS SiS "  Id = 0x505
>>>>>>>> real memory  = 125829120 (120 MB)
>>>>>>>> avail memory = 84332544 (80 MB)
>>>>>>>> kbd1 at kbdmux0
>>>>>>>> ...
>>>>>>>>     
>>>>>>>>         
>>>>>>>>             
>>>>>>>>                 
>>>>>>> Does the mboard BIOS on monitor at boot recognise all 128 M ? 
>>>>>>>
>>>>>>> I've seen boards that only recognised 1/4 of the SIM size.
>>>>>>> 80 seems a bit of an odd (non hex) number though.
>>>>>>>
>>>>>>>   
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>> Yes, at boot the board recognizes 128Mb. The RAM is embedded on the board.
>>>>>> The kernel reports real 120 Mb because maybe 8 Mb is used by video card.
>>>>>> I don't know why exact 80Mb is reported but 80 = 64+16.
>>>>>>     
>>>>>>         
>>>>>>             
>>>>> Have you tried unplugging every board (inc. ethernet scsi raid etc)
>>>>> & plugging in a different (modest, old as possible. less demanding)
>>>>> graphic card ? Maybe that'd give a clue, maybe your graphics card
>>>>> is taking more than 8M ?
>>>>>
>>>>>   
>>>>>       
>>>>>           
>>>> No, I can't unplug anything, see: 
>>>> http://www.icop.com.tw/products_detail.asp?ProductID=119
>>>>     
>>>>         
>>> Interesting little board, (might be of interest to other freebsd.org
>>> mail lists eg small, real time ).
>>>
>>> That URL specifies
>>> 	128MB SDRAM
>>> 	...
>>> 	AGP Rev.2.0 compliant
>>> 	Shared system memory up to 64MB (Default 8 MB)
>>> Maybe BIOS is no longer defaulting to 8 Meg ?
>>> Checkable / Settable in BIOS ?
>>>
>>>   
>>>       
>> I can't find anything related to video memory in the BIOS but it seems 
>> to be correct
>> real memory = 120 Mb reported by the kernel.
>> My question is why the available memory  is only 80Mb?
>>     
>
> Are you using an MFS root or a really large kernel?
>
>   
Yes, MFS root is 32 Mb and kernel is ~3.4Mb