3 ms·
This won't restore your performance in this case: the microcode changes the behavior of the zero store optimization without any action from the kernel. If you a
by BeeOnRope 5y ago
This won't restore your performance in this case: the microcode changes the behavior of the zero store optimization without any action from the kernel. If you accept the new microcode, you get the new, slower behavior.
Perhaps there is an MSR bit you can flip to set the behavior back to the old way, but none has emerged so far.
- johnisgood 5y agoThankfully I do save all of the microcodes, so I can just use an early version by simply rebuilding the initramfs. I also hold that package back on Arch, so it does not get upgraded. Might want to look for them here: https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases https://github.com/intel/Intel-Linux-Processor-Microcode-Dat... As to how to actually use those files to get your "intel-ucode.img", just take a look at: https://archlinux.org/packages/extra/any/intel-ucode/ https://archlinux.org/packages/extra/any/intel-ucode/ For the "iucode_tool": https://gitlab.com/iucode-tool/iucode-tool/-/wikis/home https://gitlab.com/iucode-tool/iucode-tool/-/wikis/home The actual PKGBUILD for it on Arch Linux: https://github.com/archlinux/svntogit-packages/blob/packages/intel-ucode/trunk/PKGBUILD https://github.com/archlinux/svntogit-packages/blob/packages... --- cd Intel-Linux-Processor-Microcode-Data-Files-microcode-${pkgver/./} rm -f intel-ucode{,-with-caveats}/list mkdir -p kernel/x86/microcode iucode_tool --write-earlyfw=intel-ucode.img intel-ucode{,-with-caveats}/ The above gives you "intel-ucode.img". Copy it to "/boot/". Run "mkinitcpio -p linux" or the like.