Hyperthreading kernel hangs

[Gerrit]

Gerrit Holl wrote:
> I figured it myself. I was searching for 'Hyperthreading' and thus
> didn't find the kernel docs about 'Hyper Threading' ;-). For the archive
> readers: in grub.conf, add "acpi=ht" to the kernel commandline. A
> precompiled kernel does so self, but I compiled my own kernel.

Unfortunately, performance seems to be worse than before.
My cpuinfo says '1400' for cpu MHz. Is this correct?
SHouldn't it me 2800 for a 2.8 GHz processor?

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 2
model name	: Intel(R) Pentium(R) 4 CPU 2.80GHz
stepping	: 9
cpu MHz		: 1400.718
cache size	: 512 KB
physical id	: 0
siblings	: 2
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
bogomips	: 2744.32

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 15
model		: 2
model name	: Intel(R) Pentium(R) 4 CPU 2.80GHz
stepping	: 9
cpu MHz		: 1400.718
cache size	: 512 KB
physical id	: 0
siblings	: 2
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
bogomips	: 2793.47

Gerrit.

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