> I was also immediately convinced that DEB_BUILD_OPTIONS=custom is the > better interface.
`apt-build` (an orphaned package) is also a good reference for doing -march=native rebuilds. https://tracker.debian.org/pkg/apt-build One of the DKMS upstream maintainers told me that we can do anything we want with DKMS, but we'd better not to abuse DKMS. > Once we know whether it makes sense to dive into this we can decide > what technique to use. Gentoo guys will be interested in the performance research, since they regard "-march" as the "most important option", and didn't mention "how important the option is", or "how faster the optimized binary will be". Reference: https://wiki.gentoo.org/wiki/Handbook:AMD64/Installation/Stage#Configuring_compile_options https://wiki.gentoo.org/wiki/GCC_optimization#-march I was confused by the observation (the 6x difference on 6900k) too and I only changed the openblas package at that time. Still investigating the root of that weird trouble ...
