** Tags removed: verification-needed-focal ** Tags added: verification-done-focal
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem-5.14 in Ubuntu. https://bugs.launchpad.net/bugs/1941893 Title: Improve performance and idle power consumption Status in amd: New Status in linux-oem-5.14 package in Ubuntu: Invalid Status in linux-oem-5.14 source package in Focal: Fix Committed Bug description: [Impact] This can improve AMD performance for all Zen or newer CPU which support C3 shares cache. [Fix] Its not necessary to flush the caches in software before entering C3. Empirical measurements show: 40-45% improvement in speedometer score. ~15% improvement in idle power. The patch is in linux-next (tag next-20211007) and can be found @ https://git.kernel.org/pub/scm/linux/kernel/git/next/linux- next.git/commit/arch/x86/kernel/acpi/cstate.c?id=a8fb40966f19ff81520d9ccf8f7e2b95201368b8 [Test] This is requested by AMD. [Where problems could occur] Low risk. This only works on AMD Zen CPUs that supports this features. AMD tested it and provided estimated measurement results. ==== Original descriptions ==== A patch queued for 5.15 to change the C3 entry will improve AMD performance. https://lore.kernel.org/patchwork/patch/1478776/ Empirical measurements show: 40-45% improvement in speedometer score. ~15% improvement in idle power. Can you please include in 5.13-oem and 5.14-oem kernels? To manage notifications about this bug go to: https://bugs.launchpad.net/amd/+bug/1941893/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
