From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Chen, Kenneth W" Date: Fri, 27 Jan 2006 02:09:48 +0000 Subject: [patch] turn on config_smt in defconfig Message-Id: <200601270209.k0R29ng21629@unix-os.sc.intel.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Now that the scheduler domain degeneration patch from Suresh Siddha was merged in the main line kernel for a while, it is safe to turn on CONFIG_SMT broadly. It has zero run time cost on system that doesn't have SMT because the SD degenerator will collapse needless domains. Signed-off-by: Ken Chen cc: Suresh Siddha --- ./arch/ia64/defconfig.orig 2006-01-26 18:40:54.579699555 -0800 +++ ./arch/ia64/defconfig 2006-01-26 18:46:31.865828235 -0800 @@ -100,7 +100,7 @@ CONFIG_FORCE_MAX_ZONEORDER CONFIG_SMP=y CONFIG_NR_CPUSQ2 CONFIG_HOTPLUG_CPU=y -# CONFIG_SCHED_SMT is not set +CONFIG_SCHED_SMT=y # CONFIG_PREEMPT is not set CONFIG_SELECT_MEMORY_MODEL=y # CONFIG_FLATMEM_MANUAL is not set --- ./arch/ia64/Kconfig.orig 2006-01-26 18:41:09.734972806 -0800 +++ ./arch/ia64/Kconfig 2006-01-26 18:43:35.204697587 -0800 @@ -266,7 +266,7 @@ config HOTPLUG_CPU config SCHED_SMT bool "SMT scheduler support" depends on SMP - default off + default y help Improves the CPU scheduler's decision making when dealing with Intel IA64 chips with MultiThreading at a cost of slightly increased