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Old 07-10-2009, 07:33 AM   #1
jonaskellens
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Fedora 10 64 bit : only 3,2 GB RAM in stead of 4 GB


I have chosen to install the 64bit of Fedora 10 to be able to use 4 GB, that is installed in my machine.

But at startup I get the following message :

Quote:
Kernel failure message 1:
WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 768MB of RAM.
------------[ cut here ]------------
WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1557 mtrr_trim_uncached_memory+0x2c3/0x2ee() (Not tainted)
Hardware name: MS-7529
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.27.25-170.2.72.fc10.x86_64 #1
Jul 10 14:20:27 jocan kernel: Call Trace:
[<ffffffff81041a22>] warn_on_slowpath+0x80/0xb0
[<ffffffff8116e84a>] ? generic_swap+0x0/0x23
[<ffffffff815abf77>] ? cmp_range+0x0/0xb
[<ffffffff8133171b>] ? printk+0x3c/0x41
[<ffffffff815ad4ef>] mtrr_trim_uncached_memory+0x2c3/0x2ee
[<ffffffff8133171b>] ? printk+0x3c/0x41
[<ffffffff815a1140>] ? early_idt_handler+0x0/0x71
[<ffffffff815a8d9f>] setup_arch+0x410/0x777
[<ffffffff81333a23>] ? _spin_lock+0xa/0xc
[<ffffffff815a1a34>] start_kernel+0x8d/0x3aa
[<ffffffff815a12ba>] x86_64_start_reservations+0xa5/0xa9
[<ffffffff815a13ae>] x86_64_start_kernel+0xcd/0xdc
Jul 10 14:20:27 jocan kernel: ---[ end trace 4eaa2a86a8e2da22 ]---


Kernel failure message 2:
WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 768MB of RAM.
------------[ cut here ]------------
WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1557 mtrr_trim_uncached_memory+0x2c3/0x2ee() (Not tainted)
Hardware name: MS-7529
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.27.25-170.2.72.fc10.x86_64 #1
Jul 10 14:09:57 jocan kernel: Call Trace:
[<ffffffff81041a22>] warn_on_slowpath+0x80/0xb0
[<ffffffff8116e84a>] ? generic_swap+0x0/0x23
[<ffffffff815abf77>] ? cmp_range+0x0/0xb
[<ffffffff8133171b>] ? printk+0x3c/0x41
[<ffffffff815ad4ef>] mtrr_trim_uncached_memory+0x2c3/0x2ee
[<ffffffff8133171b>] ? printk+0x3c/0x41
[<ffffffff815a1140>] ? early_idt_handler+0x0/0x71
[<ffffffff815a8d9f>] setup_arch+0x410/0x777
[<ffffffff81333a23>] ? _spin_lock+0xa/0xc
[<ffffffff815a1a34>] start_kernel+0x8d/0x3aa
[<ffffffff815a12ba>] x86_64_start_reservations+0xa5/0xa9
[<ffffffff815a13ae>] x86_64_start_kernel+0xcd/0xdc
Jul 10 14:09:57 jocan kernel: ---[ end trace 4eaa2a86a8e2da22 ]---
Code:
[root@jocan jonas]# free
             total       used       free     shared    buffers     cached
Mem:       3343016    1598812    1744204          0      15232     665124
-/+ buffers/cache:     918456    2424560
Swap:      4194296          0    4194296
Only 3,2 GB RAM is available... Is this normal ??
 
Old 07-10-2009, 07:46 AM   #2
johnsfine
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Quote:
Originally Posted by jonaskellens View Post
Is this normal ??
It is not normal.

I haven't seen exactly that symptom before.

Check through all the BIOS menus and see if there are any options regarding memory remapping or reporting memory to the OS, or installing the OS. One of those might affect the way the BIOS configures the ram before starting Linux.

You might also check the web site from the motherboard manufacturer to see if there is a newer version of the BIOS available.

What brand/model motherboard is it and what brand/version BIOS?

I'm not 100% certain this is a BIOS problem, but it looks like a BIOS problem.
 
Old 07-10-2009, 07:55 AM   #3
fpmurphy
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It is an MSI motherboard. I have seen this problem on an Intel DX48BT2 with a Core Duo and also with Xeon CPUs.
 
Old 07-10-2009, 08:42 AM   #4
jonaskellens
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Quote:
Originally Posted by johnsfine View Post
What brand/model motherboard is it and what brand/version BIOS?
It is a MSI G31M3-L V2 mobo with Intel G31 Express / Intel ICH7 chipset.

I choose this mobo for its Intel chipset... But there are obviously differences between a MSI with Intel chipset and an Intel mobo with Intel chipset...

There is no such option in the BIOS settings that can influence the number of GB dedicated to the OS.

Last edited by jonaskellens; 07-10-2009 at 09:11 AM.
 
Old 07-10-2009, 09:14 AM   #5
sonnik
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Is this the first time you are installing any OS in this system? Meaning, did you see any issues in other operating systems, or is this specific to Fedora 10 x86_64?
 
Old 07-10-2009, 09:17 AM   #6
johnsfine
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Quote:
Originally Posted by jonaskellens View Post
There is no such option in the BIOS settings that can influence the number of GB dedicated to the OS.
The BIOS option, if it exists, may be very confusingly named and documented.

Do you have a URL for an online copy of the motherboard manual?
 
Old 07-10-2009, 02:27 PM   #7
jonaskellens
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Quote:
Originally Posted by sonnik View Post
Is this the first time you are installing any OS in this system? Meaning, did you see any issues in other operating systems, or is this specific to Fedora 10 x86_64?
Previously I had CentOS 5.3 installed but the problem there was that CentOS saw the harddisk as IDE's but they were SATA's. I had a write-speed of 2MB/s... rather slow for SATA's huh ?!

Only option I have in the BIOS is to enable an IDE controller or not... No SATA controller for the 4 SATA ports that it holds. The SATA disks are detected in the BIOS though.

http://www.msicomputer.com/product/p...-L_V2&class=mb
 
Old 07-10-2009, 10:10 PM   #8
stureedy
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Greetings,

From what I read on the MSI web site, the latest BIOS has "Improved memory compatibility." If you're brave enough to try updating the BIOS, this might help. (I noticed that the original post contained the words "BIOS bug.")

In my experience, though; many Intel motherboards use the top of the 4GB address space for BIOS, video cards, and other PCI cards. This typically leaves 3GB plus a fraction for the OS to use.

Hope that helps!
Stu...
 
  


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