Windows 7 reports 32Gb of memory Linux/knoppix doesn't ...

[Albretch]

I got the change to use a test box with 32 Gb of RAM, but when I start it knoopix, this is what it apparently sees:
~

             total       used       free     shared    buffers     cached
Mem:       3371052     324132    3046920          0       5728     202496
-/+ buffers/cache:     115908    3255144
Swap:            0          0          0

~
based on the cheat codes
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http://www.knoppix.net/wiki/Cheat_Codes
~
you must enter mem as Megabytes, but should I use mem={32G, 32000M, or 32678M}?
~
also I notice memtest is apparently not working
~
Is there aquick fix for that? What would you suggest?
~
thanks
lbrtchx

[klaus2008]

I would suggest that you use Knoppix V6.7.1 DVD and issue

knoppix64

at the boot prompt. The usual Knoppix Linux kernel does not handle more than 4 GB RAM, but the 64-bits Linux kernel should see all the memory.

[Albretch]

knoppix64

~
was it, but I still can't figure out how to run a memtest from the command prompt.
~
how do you run memtest? Nothing seems to happen when you try:
~
boot: memtest
~
All I see is a blank screen
~
lbrtchx

[klaus2008]

You could download Memtest86 from this page. As you will see there are two different versions available. Versions 4.0b was created for servers with up to 32 cores and up to 8 TB of memory.

[Albretch]

OK, I downloaded and burned memtest86 Version 4.0b (Server) (26-Oct-2011) onto a CD, but when I boot up the box with the CD all I see is:
~

   Memtest86 Version 4.0b Server
   -----------------------------

   Select Version:

   1) Boot V4.0b Server (Default)

   2) Boot V4.0a

   3) Boot V3.5b

boot: 1
Loading memtest.....ready.

~
I don't see any progress screen or anything and when I run dmidecode in my system I see a long listing, which memory related information is encoded in chunks that look like this:
~
Does it relate to memtest not running?
~

# dmidecode 2.9
SMBIOS 2.5 present.
82 structures occupying 2627 bytes.
...
Handle 0x0036, DMI type 16, 15 bytes
Physical Memory Array
 Location: System Board Or Motherboard
 Use: System Memory
 Error Correction Type: Multi-bit ECC
 Maximum Capacity: 64 GB
 Error Information Handle: Not Provided
 Number Of Devices: 8

Handle 0x0038, DMI type 17, 27 bytes
Memory Device
 Array Handle: 0x0036
 Error Information Handle: Not Provided
 Total Width: 72 bits
 Data Width: 64 bits
 Size: 4096 MB
 Form Factor: FB-DIMM
 Set: 1
 Locator: DIMM01
 Bank Locator: Not Specified
 Type: DDR2 FB-DIMM
 Type Detail: Synchronous
 Speed: 667 MHz (1.5 ns)
 Manufacturer: <...>
 Serial Number: <...>
 Asset Tag: Not Specified
 Part Number:  

Handle 0x0042, DMI type 19, 15 bytes
Memory Array Mapped Address
 Starting Address: 0x00000000000
 Ending Address: 0x0082FFFFFFF
 Range Size: 33536 MB
 Physical Array Handle: 0x0036
 Partition Width: 0

Handle 0x0048, DMI type 20, 19 bytes
Memory Device Mapped Address
 Starting Address: 0x00430000000
 Ending Address: 0x0052FFFFFFF
 Range Size: 4 GB
 Physical Device Handle: 0x003C
 Memory Array Mapped Address Handle: 0x0042
 Partition Row Position: 4

[Albretch]

// __ http://mirror.its.uidaho.edu/pub/ubu...eases/oneiric/
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DVD version of unbuntu (AMD is used for Intel x86 as well)
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it is a displayed boot option ("test memory")
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lbrtchx

[klaus2008]

If Memtest86 doews not work on your system you could try Memtest86+. There is a download section on the web page with a pre-compiled bootable ISO.