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SubjectUpdate cacheline size on X86_GENERIC
I just noticed that configuring a kernel to use CONFIG_X86_GENERIC
(as is typical for a distro kernel) configures it to use a 128 byte cacheline size.
This made sense when that was commonplace (P4 era) but current
Intel, AMD and VIA cpus use 64 byte cachelines.

Signed-off-by: Dave Jones <davej@redhat.com>

--- linux-2.6.26.noarch/arch/x86/Kconfig.cpu~ 2008-10-09 12:59:56.000000000 -0400
+++ linux-2.6.26.noarch/arch/x86/Kconfig.cpu 2008-10-09 13:11:32.000000000 -0400
@@ -301,8 +301,8 @@ config X86_CPU
# Define implied options from the CPU selection here
config X86_L1_CACHE_BYTES
int
- default "128" if GENERIC_CPU || MPSC
- default "64" if MK8 || MCORE2
+ default "128" if MPENTIUM4 || MPSC
+ default "64" if MK8 || MCORE2 || GENERIC_CPU
depends on X86_64

config X86_INTERNODE_CACHE_BYTES
@@ -316,10 +316,10 @@ 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 || MWINCHIP2 || 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
--
http://www.codemonkey.org.uk


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