Re: memory and Debian

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Author: Kevin Brown
Date:  
To: plug-discuss
Subject: Re: memory and Debian
Linux uses the proper:
1024KB = 1MB
1024MB = 1GB
1024GB = 1TB

so your calculations would be off by 2.5% per conversion (e.g. 5% off for
GigaByte to KiloByte) if you use the 1:1000 ratio.

> This brings something to mind:
> Durring bootup 393216K of ram is detected; but free says:
>
> bmike1@1[bmike1]$ free
>              total       used       free     shared    buffers     cached
> Mem:          386396   224988     161408          0       9968     116824
> -/+ buffers/cache:      98196     288200
> Swap:      1025000               0   1025000
> bmike1@1[bmike1]$

>
> Please confirm that this has something to do with HIGHMEM or else that
> HIGHMEM is already configured into this kernel and that in the computer world
> 386396 is close enough for court to 393216K. Or perhaps I don't even approach
> the one Gbyte of which you talk. Bout doesn't 393216K = 393,216,000 and isn't
> a million= to a gig or am I just screwy?
>
>
>
> On Thursday 03 June 2004 18:51, Jay Jacobson wrote:
>
>>Bryce is right on. The HIGHMEM option is not in the kernel, thus it will
>>only see 896MB of physical RAM. You will need to recompile the kernel with
>>this enabled. From 'make menuconfig', see the "Processor type and features
>>-> HIGHMEM I/O support" stuff.
>>
>>~Jay
>>
>>..
>>.. Jay Jacobson
>>.. Edgeos, Inc. - 480.961.5996 - http://www.edgeos.com
>>..
>>.. Network Security Auditing and
>>.. Vulnerability Assessment Managed Services
>>..
>>
>>On Thu, 3 Jun 2004, Bryce C wrote:
>>
>>>More than likely, I think the kernel doesn't support 1Gb+ of memory.
>>>Don't know about debian specifically, but distros like mandrake package
>>>separate kernels for higher limits, or you can compile your own kernel
>>>(not for novices).
>>>
>>>On Thu, 2004-06-03 at 16:28, wrote:
>>>
>>>>So the system does not just detect the new amount of memory?
>>>>
>>>>I use grub, but I will look for an option like that.
>>>>
>>>>
>>>>
>>>>jim
>>>>
>>>>
>>>>>There is an option that needs to be fed to Lilo that shows the amount
>>>>>of RAM
>>>>>that a system has
>>>>>
>>>>>something like
>>>>>append=Mem=1536M
>>>>>
>>>>>
>>>>>>I added some memory to a Dell server running debian and the bios
>>>>>>reported
>>>>>>that it detected more memory during the next bootup but when I did a
>>>>>>free
>>>>>>It does not seem to report more memory, there is a more that normal
>>>>>>that is free but not 512 mb free.
>>>>>>
>>>>>>I went from 1 gig to 1.5 gigs of memory, not sure if Debian sees it
>>>>>>this way.
>>>>>>
>>>>>>
>>>>>>             total       used       free     shared    buffers
>>>>>>cached
>>>>>>Mem:        903688     817132      86556          0     134824
>>>>>>322400
>>>>>>-/+ buffers/cache:     359908     543780
>>>>>>Swap:      2032212          0    2032212

>>>>>
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>


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