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Re: 8GB memory not supported



A lot of motherboards do not support memory over 4 Gb. Check that your
motherboard supports 8 Gb of memory and also check the BIOS options.
Does your system BIOS "see" 8 Gb? If not, and there are no options for
remapping memory, you might need to replace your motherboard.

Bob Cochran


Lawrence E. Graves wrote:
>  If I am not mistaken, I believe the processor does not dictate memory
> support, your motherboard does that.  
>
>
>
> On Sat, 2009-03-07 at 16:08 +0500, saqib butt wrote:
>   
>> hi,
>>
>> I have Intel Pentium Dual Core E2180 / 2 GHz processor. i just
>> upgraded my system with 4 memory sticks i.e. 8GB of RAM due to my
>> requirements.
>>
>> Now the issue that i am facing is that my 64bit fedora system does not
>> showing and supporting more than 3.2 gigs of RAM when i consult
>> "/proc/meminfo", "free -m" and "top".
>>
>> Also I am getting the following system prompt,
>>
>> =====
>>
>> Kernel failure message 1:
>> WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 4800MB
>> of RAM.
>> ------------[ cut here ]------------
>> WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1557
>> mtrr_trim_uncached_memory+0x2c3/0x2ee() (Not tainted)
>> Hardware name:         
>> Modules linked in:
>> Pid: 0, comm: swapper Not tainted 2.6.27.19-170.2.35.fc10.x86_64 #1
>> Mar  7 15:54:38 localhost kernel: Call Trace:
>> [<ffffffff81041a52>] warn_on_slowpath+0x80/0xb0
>> [<ffffffff8116e66a>] ? generic_swap+0x0/0x23
>> [<ffffffff815a9fd3>] ? cmp_range+0x0/0xb
>> [<ffffffff81331660>] ? printk+0x3c/0x44
>> [<ffffffff815ab54b>] mtrr_trim_uncached_memory+0x2c3/0x2ee
>> [<ffffffff81331660>] ? printk+0x3c/0x44
>> [<ffffffff8159f140>] ? early_idt_handler+0x0/0x71
>> [<ffffffff815a6e2c>] setup_arch+0x410/0x777
>> [<ffffffff8133396b>] ? _spin_lock+0xa/0xc
>> [<ffffffff8159fa34>] start_kernel+0x8d/0x3aa
>> [<ffffffff8159f2ba>] x86_64_start_reservations+0xa5/0xa9
>> [<ffffffff8159f3ae>] x86_64_start_kernel+0xcd/0xdc
>> Mar  7 15:54:38 localhost kernel: ---[ end trace 4eaa2a86a8e2da22 ]---
>>
>>
>> Kernel failure message 2:
>> WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 4800MB
>> of RAM.
>> ------------[ cut here ]------------
>> WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1557
>> mtrr_trim_uncached_memory+0x2c3/0x2ee() (Not tainted)
>> Hardware name:         
>> Modules linked in:
>> Pid: 0, comm: swapper Not tainted 2.6.27.19-170.2.35.fc10.x86_64 #1
>> Mar  7 15:51:36 localhost kernel: Call Trace:
>> [<ffffffff81041a52>] warn_on_slowpath+0x80/0xb0
>> [<ffffffff8116e66a>] ? generic_swap+0x0/0x23
>> [<ffffffff815a9fd3>] ? cmp_range+0x0/0xb
>> [<ffffffff81331660>] ? printk+0x3c/0x44
>> [<ffffffff815ab54b>] mtrr_trim_uncached_memory+0x2c3/0x2ee
>> [<ffffffff81331660>] ? printk+0x3c/0x44
>> [<ffffffff8159f140>] ? early_idt_handler+0x0/0x71
>> [<ffffffff815a6e2c>] setup_arch+0x410/0x777
>> [<ffffffff8133396b>] ? _spin_lock+0xa/0xc
>> [<ffffffff8159fa34>] start_kernel+0x8d/0x3aa
>> [<ffffffff8159f2ba>] x86_64_start_reservations+0xa5/0xa9
>> [<ffffffff8159f3ae>] x86_64_start_kernel+0xcd/0xdc
>> Mar  7 15:51:36 localhost kernel: ---[ end trace 4eaa2a86a8e2da22 ]---
>>
>>
>> Kernel failure message 3:
>> WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 4800MB
>> of RAM.
>> ------------[ cut here ]------------
>> WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1557
>> mtrr_trim_uncached_memory+0x2c3/0x2ee() (Not tainted)
>> Hardware name:         
>> Modules linked in:
>> Pid: 0, comm: swapper Not tainted 2.6.27.19-170.2.35.fc10.x86_64 #1
>> Mar  7 15:33:02 localhost kernel: Call Trace:
>> [<ffffffff81041a52>] warn_on_slowpath+0x80/0xb0
>> [<ffffffff8116e66a>] ? generic_swap+0x0/0x23
>> [<ffffffff815a9fd3>] ? cmp_range+0x0/0xb
>> [<ffffffff81331660>] ? printk+0x3c/0x44
>> [<ffffffff815ab54b>] mtrr_trim_uncached_memory+0x2c3/0x2ee
>> [<ffffffff81331660>] ? printk+0x3c/0x44
>> [<ffffffff8159f140>] ? early_idt_handler+0x0/0x71
>> [<ffffffff815a6e2c>] setup_arch+0x410/0x777
>> [<ffffffff8133396b>] ? _spin_lock+0xa/0xc
>> [<ffffffff8159fa34>] start_kernel+0x8d/0x3aa
>> [<ffffffff8159f2ba>] x86_64_start_reservations+0xa5/0xa9
>> [<ffffffff8159f3ae>] x86_64_start_kernel+0xcd/0xdc
>> Mar  7 15:33:02 localhost kernel: ---[ end trace 4eaa2a86a8e2da22 ]---
>>
>>
>> Kernel failure message 4:
>> WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 4800MB
>> of RAM.
>> ------------[ cut here ]------------
>> WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1557
>> mtrr_trim_uncached_memory+0x2c3/0x2ee() (Not tainted)
>> Hardware name:         
>> Modules linked in:
>> Pid: 0, comm: swapper Not tainted 2.6.27.19-170.2.35.fc10.x86_64 #1
>> Mar  7 15:29:08 localhost kernel: Call Trace:
>> [<ffffffff81041a52>] warn_on_slowpath+0x80/0xb0
>> [<ffffffff8116e66a>] ? generic_swap+0x0/0x23
>> [<ffffffff815a9fd3>] ? cmp_range+0x0/0xb
>> [<ffffffff81331660>] ? printk+0x3c/0x44
>> [<ffffffff815ab54b>] mtrr_trim_uncached_memory+0x2c3/0x2ee
>> [<ffffffff81331660>] ? printk+0x3c/0x44
>> [<ffffffff8159f140>] ? early_idt_handler+0x0/0x71
>> [<ffffffff815a6e2c>] setup_arch+0x410/0x777
>> [<ffffffff8133396b>] ? _spin_lock+0xa/0xc
>> [<ffffffff8159fa34>] start_kernel+0x8d/0x3aa
>> [<ffffffff8159f2ba>] x86_64_start_reservations+0xa5/0xa9
>> [<ffffffff8159f3ae>] x86_64_start_kernel+0xcd/0xdc
>> Mar  7 15:29:08 localhost kernel: ---[ end trace 4eaa2a86a8e2da22 ]---
>>
>>
>> Kernel failure message 5:
>> WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 4800MB
>> of RAM.
>> ------------[ cut here ]------------
>> WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1555
>> mtrr_trim_uncached_memory+0x2b4/0x2df() (Not tainted)
>> Modules linked in:
>> Pid: 0, comm: swapper Not tainted 2.6.27.5-117.fc10.x86_64 #1
>> Mar  7 14:39:07 localhost kernel: Call Trace:
>> [<ffffffff810418f2>] warn_on_slowpath+0x60/0x90
>> [<ffffffff8116d95a>] ? generic_swap+0x0/0x23
>> [<ffffffff815a7f7f>] ? cmp_range+0x0/0xb
>> [<ffffffff8132faf6>] ? printk+0x3c/0x3e
>> [<ffffffff815a94e8>] mtrr_trim_uncached_memory+0x2b4/0x2df
>> [<ffffffff8132faf6>] ? printk+0x3c/0x3e
>> [<ffffffff8159d140>] ? early_idt_handler+0x0/0x72
>> [<ffffffff815a4dd3>] setup_arch+0x3ff/0x76b
>> [<ffffffff81331deb>] ? _spin_lock+0xa/0xc
>> [<ffffffff8159da34>] start_kernel+0x8d/0x3aa
>> [<ffffffff8159d2ba>] x86_64_start_reservations+0xa5/0xa9
>> [<ffffffff8159d3ae>] x86_64_start_kernel+0xcd/0xdc
>> Mar  7 14:39:07 localhost kernel: ---[ end trace 4eaa2a86a8e2da22 ]---
>>
>> =====
>>
>> I have "2.6.27.19-170.2.35.fc10.x86_64" version of kernel with the
>> following kernel packages installed,
>>
>> kernel-devel-2.6.27.19-170.2.35.fc10.x86_64
>> kerneloops-0.12-1.fc10.x86_64
>> kernel-headers-2.6.27.19-170.2.35.fc10.x86_64
>> kernel-firmware-2.6.27.19-170.2.35.fc10.noarch
>> kernel-doc-2.6.27.19-170.2.35.fc10.noarch
>> kernel-debug-devel-2.6.27.19-170.2.35.fc10.x86_64
>> kernel-debug-2.6.27.19-170.2.35.fc10.x86_64
>> kernel-2.6.27.19-170.2.35.fc10.x86_64
>>
>>
>> -- 
>> fedora-test-list mailing list
>> fedora-test-list redhat com
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>>     
>
>   


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