Hi again Mike, Le Monday 06 May 2013 à 11:50 +0200, Mike Galbraith a écrit :
I measured tbench, sched_yield and AIM7 compute on monteverdi with 3.9.0, and see diddly spit difference outside boot to boot and build to build variance.
I took a closer look at the code and it seems that i386 may suffer from a greater performance hit than x86_64. This is because enabling CONFIG_CC_STACKPROTECTOR on i386 disables X86_32_LAZY_GS. I am not familiar with the details but I seem to understand it's about a performance optimization of how context switches are handled. I have no idea how significant it is in practice. Would you be able to do the performance test again but on a 32-bit x86 host? Thanks, -- Jean Delvare Suse L3 -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org