/proc/cpuinfo

[Randall R Schulz]

Diego,

At 16:56 2003-05-06, Diego Biurrun wrote:
>Hello!
>
>The MPlayer documentation maintainer with shameless requests again ;-)
>
>I have a few questions about /proc/cpuinfo.
>
>On my machine I get the following output under Cygwin:
>
>processor       : 0
>vendor_id       : AuthenticAMD
>type            : primary processor
>cpu family      : 5
>model           : 13
>model name      : AMD-K6(tm)-III Processor
>stepping        : 0
>brand id        : 0
>cpu count       : 0
>apic id         : 0
>cpu MHz         : 250
>fpu             : yes
>flags           : fpu vme de pse tsc msr mce cx8 pge mmx
>
>which differs a bit from the output under Linux:
>
>processor   : 0
>vendor_id   : AuthenticAMD
>cpu family  : 5
>model       : 13
>model name  : AMD-K6(tm)-III Processor
>stepping    : 0
>cpu MHz     : 501.121
>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 mce cx8 pge mmx syscall 3dnowext 
>3dnow k6_mtrr
>bogomips    : 999.42
>
>
>The 250MHz under Cygwin are probably a bug, I have a 500MHz CPU.

Perhaps the problem has to do with the fact you have an AMD processor. 
My Pentium 4 reports precisely the correct (over-clocked) value for cpu 
MHz. The model name string reports the nominal processor speed.


>The interesting field is flags, which we use in our configure script 
>to check for processor capabilities and later optimize for the ones we 
>find.  Cygwin detects/displays less flags than Linux:
>
>flags           : fpu vme de pse tsc msr mce cx8 pge mmx
>flags       : fpu vme de pse tsc msr mce cx8 pge mmx syscall 3dnowext 
>3dnow k6_mtrr

I don't know how to interpret these, but perhaps you can ascertain the 
accuracy of what it reports on my system. It's a Pentium 4 Northwood 
mPGA-478, 0.13 micron design, 133 MHz / 533 MHz manufactured in July 
2002. Cygwin's /proc/cpuinfo reports these flags:

flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clfl dtes acpi mmx fxsr sse sse2 ss htt tmi

I attached the (WinZip-compressed) HTML output produced by the CPU-z 
1.17 (<http://www.cpuid.com/>) for this processor.

Perhaps this will help you or someone to ascertain whether the 
/proc/cpuinfo report is consistent with my processor's true nature. 
(For what it might be worth...)


>This is a pity as I now loose 3dnow and mtrr optimizations without 
>manual tweaking.
>
>I know that /proc/cpuinfo is very new on Cygwin.  Is the lack of some 
>flags a bug, or is this just implemented in a different way.  Any 
>chance of supporting those flags in the future?
>
>If somebody decides to extends /proc/cpuinfo that would be 
>tremendously appreciated.  I'm not expecting anything, of course, just hoping.
>
>Many thanks
>
>Diego


Randall Schulz 
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