The original patch was written by jeroen@linuxforge.net http://www.linuxforge.net/linux/kernel/kernel-33-gcc47-0.patch Benchmarks by graysky Three different machines running a generic x86-64 kernel and an otherwise identical kernel running with the optimized gcc options were tested using a make based endpoint. Conclusion: There are small but real speed increases using a make endpoint to running with this patch. Details: 1) Three test machines: Intel Xeon X3360, Intel i7-2620M, Intel Core i7-3660K. 2) All ran the make benchmark (linked below) 35 times while booted into a 'generic' kernel. Then all ran the same make benchmark 35 times after booting into an optimized kernel. Below are the optimizations chosen for each machine. 2a) X3360 = core2 2b) i7-2620M = corei7-avx 2c) i7-3660K = core-avx-i 3) Analyzed resulting distributions for statistical significance via ANOVA plots that clearly show statistically significant albeit small differences. Links to ANOVA plots: http://s19.postimage.org/68urcofzn/corei7_avx.png http://s19.postimage.org/ozwomuak3/core_avx_i.png http://s19.postimage.org/d0l6fj4z7/core2.png Discussion: 1) All the assumptions for ANOVA are met: *Data are normally distributed as show in the normal quantile plots. *The population variances are fairly equal (Levene and Barlett tests). 2) The ANOVA plots clearly show significance. *Pair-wise analysis by Tukey-Kramer shows significance at the 0.05 level for all CPUs compared. Below are the differences in median values: core2 +87.5 ms corei7-avx +79.7 ms core-avx-i +257.2 ms References: Bash script that controls the benchmark: https://github.com/graysky2/bin/blob/master/bench Log file generated by script: http://repo-ck.com/bench/compile_time_optimization.txt.gz --- --- linux-3.12/arch/x86/include/asm/module.h 2013-02-18 18:58:34.000000000 -0500 +++ linux-3.12.mod/arch/x86/include/asm/module.h 2013-04-11 17:40:04.064910866 -0400 @@ -15,6 +15,16 @@ #define MODULE_PROC_FAMILY "586MMX " #elif defined CONFIG_MCORE2 #define MODULE_PROC_FAMILY "CORE2 " +#elif defined CONFIG_MNATIVE +#define MODULE_PROC_FAMILY "NATIVE " +#elif defined CONFIG_MCOREI7 +#define MODULE_PROC_FAMILY "COREI7 " +#elif defined CONFIG_MCOREI7AVX +#define MODULE_PROC_FAMILY "COREI7AVX " +#elif defined CONFIG_MCOREAVXI +#define MODULE_PROC_FAMILY "COREAVXI " +#elif defined CONFIG_MCOREAVX2 +#define MODULE_PROC_FAMILY "COREAVX2 " #elif defined CONFIG_MATOM #define MODULE_PROC_FAMILY "ATOM " #elif defined CONFIG_M686 @@ -33,6 +43,16 @@ #define MODULE_PROC_FAMILY "K7 " #elif defined CONFIG_MK8 #define MODULE_PROC_FAMILY "K8 " +#elif defined CONFIG_MK10 +#define MODULE_PROC_FAMILY "K10 " +#elif defined CONFIG_MBARCELONA +#define MODULE_PROC_FAMILY "BARCELONA " +#elif defined CONFIG_MBOBCAT +#define MODULE_PROC_FAMILY "BOBCAT " +#elif defined CONFIG_MBULLDOZER +#define MODULE_PROC_FAMILY "BULLDOZER " +#elif defined CONFIG_MPILEDRIVER +#define MODULE_PROC_FAMILY "PILEDRIVER " #elif defined CONFIG_MELAN #define MODULE_PROC_FAMILY "ELAN " #elif defined CONFIG_MCRUSOE --- linux-3.12/arch/x86/Kconfig.cpu 2013-02-18 18:58:34.000000000 -0500 +++ linux-3.12.mod/arch/x86/Kconfig.cpu 2013-04-06 08:25:58.095745643 -0400 @@ -139,7 +139,7 @@ config MK6 - bool "K6/K6-II/K6-III" + bool "AMD K6/K6-II/K6-III" depends on X86_32 ---help--- Select this for an AMD K6-family processor. Enables use of @@ -147,7 +147,7 @@ flags to GCC. config MK7 - bool "Athlon/Duron/K7" + bool "AMD Athlon/Duron/K7" depends on X86_32 ---help--- Select this for an AMD Athlon K7-family processor. Enables use of @@ -155,12 +155,48 @@ flags to GCC. config MK8 - bool "Opteron/Athlon64/Hammer/K8" + bool "AMD Opteron/Athlon64/Hammer/K8" ---help--- Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables use of some extended instructions, and passes appropriate optimization flags to GCC. +config MK10 + bool "AMD 61xx/7x50/PhenomX3/X4/II/K10" + ---help--- + Select this for an AMD 61xx Eight-Core Magny-Cours, Athlon X2 7x50, + Phenom X3/X4/II, Athlon II X2/X3/X4, or Turion II-family processor. + Enables use of some extended instructions, and passes appropriate + optimization flags to GCC. + +config MBARCELONA + bool "AMD Barcelona" + ---help--- + Select this for AMD Barcelona and newer processors. + + Enables -march=barcelona + +config MBOBCAT + bool "AMD Bobcat" + ---help--- + Select this for AMD Bobcat processors. + + Enables -march=btver1 + +config MBULLDOZER + bool "AMD Bulldozer" + ---help--- + Select this for AMD Bulldozer processors. + + Enables -march=bdver1 + +config MPILEDRIVER + bool "AMD Piledriver" + ---help--- + Select this for AMD Piledriver processors. + + Enables -march=bdver2 + config MCRUSOE bool "Crusoe" depends on X86_32 @@ -251,8 +287,17 @@ using the cpu family field in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one. +config MATOM + bool "Intel Atom" + ---help--- + + Select this for the Intel Atom platform. Intel Atom CPUs have an + in-order pipelining architecture and thus can benefit from + accordingly optimized code. Use a recent GCC with specific Atom + support in order to fully benefit from selecting this option. + config MCORE2 - bool "Core 2/newer Xeon" + bool "Intel Core 2" ---help--- Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and @@ -260,14 +305,40 @@ family in /proc/cpuinfo. Newer ones have 6 and older ones 15 (not a typo) -config MATOM - bool "Intel Atom" + Enables -march=core2 + +config MCOREI7 + bool "Intel Core i7" ---help--- - Select this for the Intel Atom platform. Intel Atom CPUs have an - in-order pipelining architecture and thus can benefit from - accordingly optimized code. Use a recent GCC with specific Atom - support in order to fully benefit from selecting this option. + Select this for the Intel Nehalem platform. Intel Nehalem proecessors + include Core i3, i5, i7, Xeon: 34xx, 35xx, 55xx, 56xx, 75xx processors. + + Enables -march=corei7 + +config MCOREI7AVX + bool "Intel Core 2nd Gen AVX" + ---help--- + + Select this for 2nd Gen Core processors including Sandy Bridge. + + Enables -march=corei7-avx + +config MCOREAVXI + bool "Intel Core 3rd Gen AVX" + ---help--- + + Select this for 3rd Gen Core processors including Ivy Bridge. + + Enables -march=core-avx-i + +config MCOREAVX2 + bool "Intel Core AVX2" + ---help--- + + Select this for AVX2 enabled processors including Haswell. + + Enables -march=core-avx2 config GENERIC_CPU bool "Generic-x86-64" @@ -276,6 +347,19 @@ Generic x86-64 CPU. Run equally well on all x86-64 CPUs. +config MNATIVE + bool "Native optimizations autodetected by GCC" + ---help--- + + GCC 4.2 and above support -march=native, which automatically detects + the optimum settings to use based on your processor. -march=native + also detects and applies additional settings beyond -march specific + to your CPU, (eg. -msse4). Unless you have a specific reason not to + (e.g. distcc cross-compiling), you should probably be using + -march=native rather than anything listed below. + + Enables -march=native + endchoice config X86_GENERIC @@ -300,7 +384,7 @@ config X86_L1_CACHE_SHIFT int default "7" if MPENTIUM4 || MPSC - default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU + default "6" if MK7 || MK8 || MK10 || MBARCELONA || MBOBCAT || MBULLDOZER || MPILEDRIVER || MPENTIUMM || MCORE2 || MCOREI7 || MCOREI7AVX || MCOREAVXI || MCOREAVX2 || MATOM || MVIAC7 || X86_GENERIC || MNATIVE || GENERIC_CPU default "4" if MELAN || M486 || MGEODEGX1 default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX @@ -331,11 +415,11 @@ config X86_INTEL_USERCOPY def_bool y - depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2 + depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || MNATIVE || X86_GENERIC || MK8 || MK7 || MK10 || MBARCELONA || MEFFICEON || MCORE2 || MCOREI7 || MCOREI7AVX || MCOREAVXI || MCOREAVX2 config X86_USE_PPRO_CHECKSUM def_bool y - depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM + depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MK10 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MCOREI7 || MCOREI7AVX || MCOREAVXI || MCOREAVX2 || MATOM || MNATIVE config X86_USE_3DNOW def_bool y @@ -363,17 +447,17 @@ config X86_TSC def_bool y - depends on ((MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2 || MATOM) && !X86_NUMAQ) || X86_64 + depends on ((MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MK10 || MBARCELONA || MBOBCAT || MBULLDOZER || MPILEDRIVER || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2 || MCOREI7 || MCOREI7-AVX || MATOM) && !X86_NUMAQ) || X86_64 || MNATIVE config X86_CMPXCHG64 def_bool y - depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM + depends on X86_PAE || X86_64 || MCORE2 || MCOREI7 || MCOREI7AVX || MCOREAVXI || MCOREAVX2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM || MNATIVE # this should be set for all -march=.. options where the compiler # generates cmov. config X86_CMOV def_bool y - depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX) + depends on (MK8 || MK10 || MBARCELONA || MBOBCAT || MBULLDOZER || MPILEDRIVER || MK7 || MCORE2 || MCOREI7 || MCOREI7AVX || MCOREAVXI || MCOREAVX2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MNATIVE || MATOM || MGEODE_LX) config X86_MINIMUM_CPU_FAMILY int --- linux-3.12/arch/x86/Makefile 2012-12-10 22:30:57.000000000 -0500 +++ linux-3.12.mod/arch/x86/Makefile 2013-04-06 07:36:39.349203123 -0400 @@ -57,11 +57,25 @@ KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3) # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) + cflags-$(CONFIG_MNATIVE) += $(call cc-option,-march=native) cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) + cflags-$(CONFIG_MK10) += $(call cc-option,-march=amdfam10) + cflags-$(CONFIG_MBARCELONA) += $(call cc-option,-march=barcelona) + cflags-$(CONFIG_MBOBCAT) += $(call cc-option,-march=btver1) + cflags-$(CONFIG_MBULLDOZER) += $(call cc-option,-march=bdver1) + cflags-$(CONFIG_MPILEDRIVER) += $(call cc-option,-march=bdver2) cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) cflags-$(CONFIG_MCORE2) += \ - $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) + $(call cc-option,-march=core2,$(call cc-option,-mtune=core2)) + cflags-$(CONFIG_MCOREI7) += \ + $(call cc-option,-march=corei7,$(call cc-option,-mtune=corei7)) + cflags-$(CONFIG_MCOREI7AVX) += \ + $(call cc-option,-march=corei7-avx,$(call cc-option,-mtune=corei7-avx)) + cflags-$(CONFIG_MCOREAVXI) += \ + $(call cc-option,-march=core-avx-i,$(call cc-option,-mtune=core-avx-i)) + cflags-$(CONFIG_MCOREAVX2) += \ + $(call cc-option,-march=core-avx2,$(call cc-option,-mtune=core-avx2)) cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) --- linux-3.12/arch/x86/Makefile_32.cpu 2012-12-10 22:30:57.000000000 -0500 +++ linux-3.12.mod/arch/x86/Makefile_32.cpu 2013-04-06 07:37:31.754423693 -0400 @@ -23,7 +23,13 @@ # Please note, that patches that add -march=athlon-xp and friends are pointless. # They make zero difference whatsosever to performance at this time. cflags-$(CONFIG_MK7) += -march=athlon +cflags-$(CONFIG_MNATIVE) += $(call cc-option,-march=native) cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon) +cflags-$(CONFIG_MK10) += $(call cc-option,-march=amdfam10,-march=athlon) +cflags-$(CONFIG_MBARCELONA) += $(call cc-option,-march=barcelona,-march=athlon) +cflags-$(CONFIG_MBOBCAT) += $(call cc-option,-march=btver1,-march=athlon) +cflags-$(CONFIG_MBULLDOZER) += $(call cc-option,-march=bdver1,-march=athlon) +cflags-$(CONFIG_MPILEDRIVER) += $(call cc-option,-march=bdver2,-march=athlon) cflags-$(CONFIG_MCRUSOE) += -march=i686 $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0 cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0 cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586) @@ -32,6 +38,10 @@ cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686) cflags-$(CONFIG_MVIAC7) += -march=i686 cflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2) +cflags-$(CONFIG_MCOREI7) += -march=i686 $(call tune,corei7) +cflags-$(CONFIG_MCOREI7AVX) += -march=i686 $(call tune,corei7-avx) +cflags-$(CONFIG_MCOREAVXI) += -march=i686 $(call tune,core-avx-i) +cflags-$(CONFIG_MCOREAVX2) += -march=i686 $(call tune,core-avx2) cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom,$(call cc-option,-march=core2,-march=i686)) \ $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))