x86: change the default cache size to 64 bytes

Right now the generic cacheline size is 128 bytes - that is wasteful
when structures are aligned, as all modern x86 CPUs have an (effective)
cacheline sizes of 64 bytes.

It was set to 128 bytes due to some cacheline aliasing problems on
older P4 systems, but those are many years old and we dont optimize
for them anymore. (They'll still get the 128 bytes cacheline size if
the kernel is specifically built for Pentium 4)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 8078955..cdf4a96 100644 (file)
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -307,10 +307,10 @@ config X86_CMPXCHG
 
 config X86_L1_CACHE_SHIFT
        int
-       default "7" if MPENTIUM4 || X86_GENERIC || GENERIC_CPU || MPSC
+       default "7" if MPENTIUM4 || MPSC
        default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
        default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
-       default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MVIAC7
+       default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MVIAC7 || X86_GENERIC || GENERIC_CPU
 
 config X86_XADD
        def_bool y