Rigth Kernel for a Athlon64 dual core for Debian

[amrlima]

Hi,

I have Lenny installed on my AMD Athlon 64 dual core.

vendor_id : AuthenticAMD
cpu family : 15
model : 107
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4000+
stepping : 1
cpu MHz : 2109.545
cache size : 512 KB

my kernel is 2.6.22-3-486. I notice that system monitor only show one of the CPUs. Is this a big inconvenience? I'm wasting performance on my PC?

If so what is the best kernel for my processor? 2.6.22-3-amd64?
If I install a 64 bit kernel I will have to reinstall many 64 bit packages right?

Thanks!!
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[Temüjin]

Please run:
uname -a
I don't know if you're running an SMP kernel that can recognize both cores. You don't need a 64-bit kernel/system to see both cores,
If I install a 64 bit kernel I will have to reinstall many 64 bit packages right?
Yes. If you've already put a lot of work into configuring your system, I would not recommend reinstalling with 64-bit.