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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: Simple #define for cache line size
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Robert Watson wrote:

> --- i386/include/param.h    (revision 190941)
> +++ i386/include/param.h    (working copy)
> @@ -74,6 +74,10 @@
>  #define ALIGNBYTES    _ALIGNBYTES
>  #define ALIGN(p)    _ALIGN(p)
>=20
> +#ifndef CACHE_LINE_SIZE
> +#define    CACHE_LINE_SIZE    64
> +#endif

Wouldn't it be better to continue the

cpu             I486_CPU
cpu             I586_CPU
cpu             I686_CPU

series of defines in kernel configuration and define alignment per CPU
architecture? I guess it depends on the trends - are cache lines
expected to change in the near future? :)



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