From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Siddha, Suresh B" Date: Tue, 05 Apr 2005 17:05:03 +0000 Subject: [Patch] Add config SCHED_SMT Message-Id: <20050405100503.A17170@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 we have MC/MT detection patches in, appended patch allows us to configure MT scheduler optimizations. For now, we will this option off by default. There is some discussion going on lkml about setting up sched-domains which are absolutely needed (like for example, we shouldn't setup SMT domain for non MT processors). Once that patch goes in, we can enable this option by default. Signed-off-by: Suresh Siddha diff -Nru linux-2.6.12-test/arch/ia64/Kconfig linux-2.6.12-test-mc/arch/ia64/Kconfig --- linux-2.6.12-test/arch/ia64/Kconfig 2005-03-16 18:15:06.000000000 -0800 +++ linux-2.6.12-test-mc/arch/ia64/Kconfig 2005-04-05 09:52:31.000000000 -0700 @@ -260,6 +260,15 @@ can be controlled through /sys/devices/system/cpu/cpu#. Say N if you want to disable CPU hotplug. +config SCHED_SMT + bool "SMT scheduler support" + depends on SMP + default off + help + Improves the CPU scheduler's decision making when dealing with + Intel IA64 chips with MultiThreading at a cost of slightly increased + overhead in some places. If unsure say N here. + config PREEMPT bool "Preemptible Kernel" help