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

[Matthew Flaschen]

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.

Yeah, but if you're not planning to use the 64-bit capabilities it
doesn't matter. One more thing to try:

cat /proc/cpuinfo

If you see info for two CPUs you should be good.

Matt Flaschen