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SubjectRe: HZ value
On Tue, Nov 06, 2001 at 04:15:25PM +0200, Yoav Etsion wrote:
> Hi,
>
> Does anyone know why the HZ (asm/param.h) value on the Alpha (1000) is
> different than on any architecture (100)?

It is 1024.

Why should it be anything in particular ?

It being 1024 gives nice properties in certain obscure
internal time functions. 100 or 1000 can not use same
tricks as 1024 when a division is needed...

The 100 is usual UNIX tradition, although other values
were present in earlier times. Alpha on the other
hand has always been a rather fast beast, and there
a faster timer tick is somewhat justified.

That 100 is tough for a 386/20MHz, but 1024 is no problem
for a Pentium-IV/1.5GHz.

> Thanks,
> Yoav Etsion

/Matti Aarnio
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