My cpu infomation is:
bash-3.1$ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 8
model name : AMD Sempron(tm) 2400+
stepping : 1
cpu MHz : 1664.640
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow up ts
bogomips : 3332.03
clflush size : 32
bash-3.1$ uname -a
Linux antlers 2.6.21.5-smp #2 SMP Tue Jun 19 14:58:11 CDT 2007 i686 AMD Sempron(tm) 2400+ AuthenticAMD GNU/Linux
This is my system infomation.I think the kernel-smp don't needed.Right?
So,i want to chang smp to nosmp.How do it?Please help me.Thanks.

You don't need to change. I ran 12.0 with a similar processor (AMD Sempron 2600+) using the smp kernel, it's OK.

I've ran smp kernels on more lowly hardware than that - 300Mhz PII's - and it worked fine.

Thanks for you reports.I just hear if you have one processor the nosmp kernel can be better running.Now i know there is no need to change it.Thanks.