AMD 64 Dual Core only using one Core (was Re: Going from i386 AMD 64 Dual Core)

[Phil Pinkerton]

I just installed from the Ubuntu 64 bit install CD onto an Acer 5102 AMD
64(x2) and did the update, upgrade, dist-upgrade series and I got:

Linux quecaixa 2.6.20-14-generic #2 SMP Mon Apr 2 16:32:46 UTC 2007
x86_64 GNU/Linux

Where "quecaixa" is my system name

TOP SHOWS (after pressing 1)

top - 17:42:50 up  1:02,  1 user,  load average: 0.35, 0.23, 0.26
Tasks: 125 total,   1 running, 124 sleeping,   0 stopped,   0 zombie
Cpu0  :  2.1%us,  0.3%sy,  0.0%ni, 97.6%id,  0.0%wa,  0.0%hi,  0.0%si, 
0.0%st
Cpu1  :  1.0%us,  0.3%sy,  0.0%ni, 98.6%id,  0.0%wa,  0.0%hi,  0.0%si, 
0.0%st
Mem:   1930060k total,   942860k used,   987200k free,    45740k buffers
Swap:  7478248k total,        0k used,  7478248k free,   566168k cached

So I assume you should see something similar.

phil


Ben Edwards wrote:
> On 09/04/07, Matthew Flaschen <matthew.flaschen at gatech.edu> wrote:
>   
>> Rashkae wrote:
>>     
>>> Ben Edwards wrote:
>>>       
>>>> Do I have to use the amd64 distribution to use both cores?
>>>>
>>>>         
>>> No, you need an SMP kernel to use both cores.  I thought the default
>>> Ubuntu Kernels were SMP, but I could be wrong, and can't verify right now.
>>>       
>> I am almost certain the default is not SMP.  It's quite simple to check.
>>  It doesn't require actually monitoring the CPUs.  Just do:
>>
>> uname -a
>>
>> I have:
>>
>> Linux e1505-laptop 2.6.15-28-686 #1 SMP PREEMPT Mon Mar 19 01:49:06 UTC
>> 2007 i686 GNU/Linux
>>     
>
> I have
>
> Linux fisk 2.6.20-14-generic #2 SMP Mon Apr 2 20:37:49 UTC 2007 i686 GNU/Linux
>
> Witch seems to be SMP!  Maybe it is not really.
>
>   
>> If yours doesn't show SMP, the kernel is not using both cores, and you
>> should install linux-image-686 (or apparently linux-image-generic but
>> I'm skeptical).
>>     
>
> linux-image-686  seems to point to generic, this is all a bit strange,
> any ideas?
>
> Ime using AMD anyway.
>
> Ben
>
>   
>> Matthew Flaschen
>>
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>>
>>     
>
>
>