1 GB memory module

[Yannick ROGER]

Hello,
I just got a new 1GB memory module for my presario R3000 to add to my
512 MB. The bios (and windows...) detect more than 1500MB, but linux
only sees 1139MB. Do you guys have any idea why ?

Thanks for your answers,

--
Yannick

[Håkan Wikström]

Post by Yannick ROGER
Hello,
I just got a new 1GB memory module for my presario R3000 to add to my
512 MB. The bios (and windows...) detect more than 1500MB, but linux
only sees 1139MB. Do you guys have any idea why ?
Thanks for your answers,
--
Yannick

It sounds like you don't have a kernel configured with high memory
support. If you don't, and have more than 1GB or so you will only see
about 824MB of it, but recently some distributions patch their kernels
to have 1GB of low memory support. I would think this is what you have
encountered.

Configure your kernel to have 4GB memory support and you should be OK.

Håkan

[John Jason Jordan]

On Sat, 26 Aug 2006 11:56:39 +0200

Post by Håkan Wikström

Post by Yannick ROGER
Hello,
I just got a new 1GB memory module for my presario R3000 to add to my
512 MB. The bios (and windows...) detect more than 1500MB, but linux
only sees 1139MB. Do you guys have any idea why ?

Configure your kernel to have 4GB memory support and you should be OK.

I don't know if Håkan's solution is what you need, but I can add that I
have an R3240 with 1.25 GB and my Ubuntu-64 Dapper sees and uses it all
just fine. I never had to do anything for it to work, starting with
Hoary a year ago.

PS: This machine came with two 256 MB sticks. I left the one under the
keyboard alone, and just swapped out the one that is easy to get at for
a 1 GB stick. That is how I ended up with 1.25 GB. I still have the 256
MB stick that I have no use for. If someone needs it, I'll sell it for
half what it would cost to get it new somewhere. Reply off-list please.

[Yannick ROGER]

Hello,

Håkan's solution seems to be right. I checked my kernel config and :
# CONFIG_HIGHMEM4G is not set
# CONFIG_HIGHMEM64G is not set

I'm running Debian testing with the default 2.6.16-2-486 kernel. So I tried running a Ubuntu live CD and as John said it works just fine and sees all the memory.

I was also wondering which kernel architecture is the best for an AMD64 running a 32 bits OS.

Thanks for your answers,

Yannick

Post by John Jason Jordan
On Sat, 26 Aug 2006 11:56:39 +0200

Post by Håkan Wikström

Post by Yannick ROGER
Hello,
I just got a new 1GB memory module for my presario R3000 to add to my
512 MB. The bios (and windows...) detect more than 1500MB, but linux
only sees 1139MB. Do you guys have any idea why ?

Configure your kernel to have 4GB memory support and you should be OK.

I don't know if Håkan's solution is what you need, but I can add that I
have an R3240 with 1.25 GB and my Ubuntu-64 Dapper sees and uses it all
just fine. I never had to do anything for it to work, starting with
Hoary a year ago.
PS: This machine came with two 256 MB sticks. I left the one under the
keyboard alone, and just swapped out the one that is easy to get at for
a 1 GB stick. That is how I ended up with 1.25 GB. I still have the 256
MB stick that I have no use for. If someone needs it, I'll sell it for
half what it would cost to get it new somewhere. Reply off-list please.
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