Margit Schubert-While <margit@margit.com> writes:
E> What should be the value of L1_CACHE_SHIFT for a P4 ?
> L1_CACHE_BYTES is set to 1<<L1_CACHE_SHIFT
>
> In the .config , I notice that L1_CACHE_SHIFT is being set to 7 for the P4.
> Surely that can't be right or ?
The P4 has 128byte L2 cache lines (2^7). The L1 apparently has smaller lines.
For practical reasons the L1_CACHE_BYTES defines should not be smaller than
the L2 line size - otherwise slab's cache colouring would not be very
effective. In fact the symbol is a bit misnamed, it refers to all CPU caches.
So it needs to be 7.
-Andi
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This archive was generated by hypermail 2b29 : Sat Nov 23 2002 - 22:00:36 EST