amd64 webpage, 12GB memory? 64-bit or not? SMP or not?

Steve Kargl sgk at
Sat Mar 18 04:41:12 UTC 2006

On Fri, Mar 17, 2006 at 08:08:17PM -0800, Jeremy C. Reed wrote:
> How can I tell if a 2.80Ghz Xeon is a 32-bit Xeon or a 64-bit Xeon? What 
> do I look for in the 6.0-RELEASE GENERIC i386 dmesg output? I do see:
> ACPI APIC Table: <PTLTD          APIC  >
> Timecounter "i8254" frequency 1193182 Hz quality 0
> CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2793.01-MHz 686-class CPU)
You're running a i386 kernel, which is 32-bit.

>   Features2=0x641d<SSE3,RSVD2,MON,DS_CPL,CNTX-ID,CX16,<b14>>
>   AMD Features=0x20100000<NX,LM>
>   Hyperthreading: 2 logical CPUs
> real memory  = 3489071104 (3327 MB)
> avail memory = 3414630400 (3256 MB)
> How can I tell if it can take advantage of "options SMP" (from looking at 
> 6.0-RELEASE i386 GENERIC output)? (I do see "Hyperthreading: 2 logical 
> CPUs".)

You're using a GENERIC kernel.  IIRC, "options SMP" isn't included
in GENERIC, so you're running a UP kernel.  You need to rebuild
the kernel

> I was told it has 12 GB of memory. The Hardware Notes also says "The 
> largest tested memory configuration to date is 8GB." But I only see "real 
> memory = 3489071104 (3327 MB)".

The i386 is limited to 4 GB address space without options PAE.  You
need to rebuild your kernel.


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