Gentoo Forums
Gentoo Forums
Gentoo Forums
Quick Search: in
Linux only recognizing 883mb of 1024mb RAM installed
View unanswered posts
View posts from last 24 hours

 
Reply to topic    Gentoo Forums Forum Index Duplicate Threads
View previous topic :: View next topic  
Author Message
andrewy
l33t
l33t


Joined: 07 Apr 2004
Posts: 602

PostPosted: Sun Mar 06, 2005 9:00 pm    Post subject: Linux only recognizing 883mb of 1024mb RAM installed Reply with quote

I just added another 512mb of PC2700 DDR RAM to my computer.
When it boots up, the BIOS recognizes 1040000 (approximately) KB of RAM, but Linux only recognizes some of it.
Code:

$ free
             total       used       free     shared    buffers     cached
Mem:        904268     307340     596928          0      16468     141088
-/+ buffers/cache:     149784     754484
Swap:      1292460          0    1292460


Does anyone know why this is happening?
Back to top
View user's profile Send private message
Earthwings
Bodhisattva
Bodhisattva


Joined: 14 Apr 2003
Posts: 7753
Location: Karlsruhe, Germany

PostPosted: Sun Mar 06, 2005 9:08 pm    Post subject: Reply with quote

CONFIG_HIGHMEM in your kernel.
Back to top
View user's profile Send private message
andrewy
l33t
l33t


Joined: 07 Apr 2004
Posts: 602

PostPosted: Sun Mar 06, 2005 11:13 pm    Post subject: Reply with quote

I thought CONFIG_HIGHMEM only effects systems with 1gb+?
Guess not. thanks.
Back to top
View user's profile Send private message
Earthwings
Bodhisattva
Bodhisattva


Joined: 14 Apr 2003
Posts: 7753
Location: Karlsruhe, Germany

PostPosted: Mon Mar 07, 2005 7:50 am    Post subject: Reply with quote

andrewy wrote:
I thought CONFIG_HIGHMEM only effects systems with 1gb+?
Guess not. thanks.

Not in the vanilla kernel sources. IIRC there are some patched sources (ck?) though that allow 1 GB without CONFIG_HIGHMEM.
Back to top
View user's profile Send private message
transient
l33t
l33t


Joined: 13 Jan 2005
Posts: 759

PostPosted: Mon Mar 07, 2005 9:09 am    Post subject: Reply with quote

The ck-sources shift the memory split up to 1GB, so you can have 1GB of RAM without the extra overhead of HIMEM support.
Back to top
View user's profile Send private message
bollucks
l33t
l33t


Joined: 27 Oct 2004
Posts: 606

PostPosted: Mon Mar 07, 2005 9:12 am    Post subject: Reply with quote

transient wrote:
The ck-sources shift the memory split up to 1GB, so you can have 1GB of RAM without the extra overhead of HIMEM support.
Without the -ck patch for it you have to enable HIGHMEM for at least 4GB to get any more than 896MB on x86 architectures.
Back to top
View user's profile Send private message
andrewy
l33t
l33t


Joined: 07 Apr 2004
Posts: 602

PostPosted: Mon Mar 07, 2005 9:33 pm    Post subject: Reply with quote

ok, I didn't realise that. Thanks.
I'm using the gentoo 2.6 sources, but I don't think they have any -ck patches in them.
Back to top
View user's profile Send private message
Maedhros
Bodhisattva
Bodhisattva


Joined: 14 Apr 2004
Posts: 5511
Location: Durham, UK

PostPosted: Tue Sep 06, 2005 7:14 am    Post subject: Reply with quote

Moved from Kernel & Hardware to Duplicate Threads in favour of 1GB of memory but only 885 being seen?
_________________
No-one's more important than the earthworm.
Back to top
View user's profile Send private message
Display posts from previous:   
Reply to topic    Gentoo Forums Forum Index Duplicate Threads All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum