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RE: /proc/cpuinfo
Chris January writes:
> > 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.
> This value is taken from the Windows registry. Linux calculates it from
> scratch it during its BogoMIPS initialisation. Have a look in your Windows
> System control panel and you should see the same incorrect value.
As I said, it's a bug, but in Windows not in Cygwin ;-)
> > 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
> >
> > 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.
> I used the Intel list of flags, but the list is slightly different on AMD
> (e.g. 3dnow). If you can find and send me a list of the cpuid features flags
> for AMD processors I'll add this in.
I'll try to come up with something, expect to hear from me soon.
Thanks
Diego
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