AMD64 overclock issue with 2.6.16 but not with 2.6.15

[JimD <Jim@keeliegirl.dyndns.org>]

Do any one know of any other issues with amd64 and the
2.6.16 series?  I have run into a weird issue.

I have an AMD64 3200+ that runs at 2 GHz and runs *very* cool at about
34c.  My motherboard makes it pretty easy to overclock so I have
overclocked the 3200+ to 2.2 GHz and it has been running very stable
and still only around 39c.

When I was runing overclocked in 2.6.15 /proc/cpuinfo would show:

jim@keelie$ cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 47
model name      : AMD Athlon(tm) 64 Processor 3200+
stepping        : 2
cpu MHz         : 2200.000
cache size      : 512 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 clflush mmx fxsr sse sse2
                  syscall nx mmxext fxsr_opt lm 3dnowext 3dnow pni
                  lahf_lm ts fid vid ttp tm stc
bogomips        : 4409.17


Now with 2.6.16 it shows:

jim@keelie$ cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 47
model name      : AMD Athlon(tm) 64 Processor 3200+
stepping        : 2
cpu MHz         : 2000.000
                 ^^^^^^^^^^
<snip>
bogomips        : 4409.17


The bogomips are showing the same though the kernel is not reporting
the correct MHz.  If I reboot and check the BIOS, the correct MHz is
reported.  I have not run any CPU benchmarks to see if performance is
really going back down to 2000 MHz.

Does anyone have a clue what could be causing this?

Jim