Re: [2.4 patch] fix CONFIG_X86_L1_CACHE_SHIFT

[Andi Kleen]

Adrian Bunk <bunk@xxxxxxxxx> writes:

> With CONFIG_M686 CONFIG_X86_L1_CACHE_SHIFT was set to 5, but a Pentium 4 
> requires 7.

It doesn't require 7, it just prefers 7. 

> The patch below does:
> - set CONFIG_X86_L1_CACHE_SHIFT 7 for all Intel processors (needed for 
>   the Pentium 4)
> - set CONFIG_X86_L1_CACHE_SHIFT 6 for the K6 (needed for the Athlon)

I think these changes should be only done with CONFIG_X86_GENERIC is set.

Otherwise the people who want kernels really optimized for their CPUs
won't get the full benefit. On UP it does not make that much difference,
but on a SMP kernel having a bigger than needed cache size wastes a lot
of memory.

-Andi
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