[2.1.1] CPU speed detection under Linux

[Hirogen2]

CPU speed detection seems borked on Linux:

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18:32 shanghai:../BUILD/zdoom-2.1.1 > zdoom
 adding /usr/src/packages/BUILD/zdoom-2.1.1/zdoom.pk3
 adding /usr/share/zdoom/doom2.wad (2919 lumps)
CPU Speed: ~0.038825 MHz
CPU Vendor ID: AuthenticAMD
  Name: AMD Athlon(tm) XP 2000+
  Family 6 (7), Model 8, Stepping 0
  Features: MMX MMX+ SSE 3DNow! 3DNow!+

0.03 MHz cannot be. For the record, CONFIG_HZ=100 here. The real thing is

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18:34 shanghai:../BUILD/zdoom-2.1.1 > cat /proc/cpuinfo 
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 8
model name      : AMD Athlon(tm) XP 2000+
stepping        : 0
cpu MHz         : 1666.747
cache size      : 256 KB
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow up ts
bogomips        : 3335.23

[Siggi]

I'm also having this.
Ussualy it reports my CPU speed to be 1000mhz, when it's really 1800mhz (sempron 3000+).
Sometimes it shows it as 0.03mhz.

[randi]

It's only used for some statistics timers that are normally offscreen. I've also known for years that it won't work properly on systems that change the processor's frequency on demand, but that hasn't motivated me to do anything about it.

If you'd like to see this fixed, feel free to write a better routine yourself. I'd be happy to use it.