Re: /proc/cpuinfo

[Randall R Schulz <rschulz at sonic dot net>]

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

Attachment: cpuz.zip
Description: Zip archive

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