On 09/29/2013 02:01 PM, Borislav Petkov wrote: > On Sun, Sep 29, 2013 at 01:54:00PM -0400, Austin S Hemmelgarn > wrote: >> From: Austin S. Hemmelgarn <ahferro...@gmail.com> >> >> This patch adds Kconfig options to allow optimization for AMD >> family 10h, AMD Bulldozer, and AMD Piledriver derived CPU's in >> version 3.12-rc2. These provide noticeable improvements over the >> K8 config option, and allow the kernel to take full advantage of >> AMD specific instruction set extensions, such as ABM, LZCNT, and >> POPCNT. > > A patch like that keeps popping up every couple of months. Please > show us those noticeable improvements because the guy last time > failed to do so. > > And also, keep in mind that distro kernels are built with > CONFIG_GENERIC_CPU so CPU-specific kernels are used only by the > small percentage of people who actually do build their own > kernels. > > Thanks. > While I understand that you want decisive proof that it provides an improvement, does it specifically matter if the option is unused by most people and doesn't result in a negative performance hit when used?
I will, however, do some intensive profiling over the next week and get back to you about exact improvements. Just in the past few days of using it, I have noticed much better response time in time sensitive user-space code (mostly emulators and multimedia apps). -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
