Re: Cyrix 6x86MX and Centaur C6 CPUs in 2.1.102

=?ISO-8859-1?Q?Andr=E9?= Derrick Balsa (
Thu, 21 May 1998 17:33:10 -0100


Vojtech Pavlik wrote:
> On Thu, May 21, 1998 at 03:44:27PM +0200, Martin Mares wrote:
> > > BTW TSC calibration in the setup code would allow showing MHz rating in
> > > /proc/cpuinfo, so people would stop wondering why they get bogomips such
> > > and such everytime a new x86 processor comes out.
> >
> > This would be interesting, but remember that CPU clock speed need not
> > to be equal TSC frequency.
> Yes, but for all the chips produced up to now it is equal, and for later
> chips we may decide based on the chip revision / manufacturer and if needed
> apply a TSC per sec / CPU clocks per sec ratio for the respective chip to
> get the correct CPU frequency.
> Vojtech

Well, in fact the TSC *is* supposed to *exactly* count CPU clock cycles,
so I don't see what Martin means by "CPU clock speed need not be equal
to TSC frequency".

Please enlighten me :)

André Balsa

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