On Sat, Jan 4, 2025 at 7:52 AM Franco Martelli wrote: > > On 02/01/25 at 12:53, Istvan Toth wrote: > > amd 5700G cpu > > If you are new to kernel compiling maybe you don't know that you can > optimize the kernel for your specific CPU architecture, if you are using > the GCC compiler: > > first make a backup copy of the Makefile: > $ cd linux-source-6.1 > $ cp arch/x86/Makefile arch/x86/Makefile.backup > > then edit "arch/x86/Makefile": > $ cd linux-source-6.1 > $ vi arch/x86/Makefile > > at line 152 change: > cflags-$(CONFIG_MK8) += -march=k8 > to > cflags-$(CONFIG_MK8) += -march=znver3 > and below at line 159 change > rustflags-$(CONFIG_MK8) += -Ctarget-cpu=k8 > to > rustflags-$(CONFIG_MK8) += -Ctarget-cpu=znver3 > > save and exit vim. "znver3" is the GCC's switch for the µarch of your GPU.
GPU or central processing unit? As long as you're not cross-compiling, how is march=znver3 better than march=native ? On my machine, 'man gcc' has the "znver1" and "znver2" strings, but no "znver3" so it seems like "march=native" would be more correct.. or at least less chances of an error. ... assuming there are no drawbacks to using "march=native". TIA, Lee
