From mboxrd@z Thu Jan 1 00:00:00 1970 From: Carl-Daniel Hailfinger Subject: Re: [RFC] Fix NMI watchdog documentation Date: Sat, 24 May 2003 21:43:55 +0200 Sender: linux-smp-owner@vger.kernel.org Message-ID: <3ECFCB7B.4080107@gmx.net> References: <3ECFC2D6.2020007@gmx.net> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Id: Content-Type: text/plain; charset="us-ascii" To: Zwane Mwaikambo Cc: Linux Kernel Mailing List , linux-smp@vger.kernel.org, Ingo Molnar , Marc-Christian Petersen Zwane Mwaikambo wrote: > On Sat, 24 May 2003, Zwane Mwaikambo wrote: > > >>For nmi_watchdog=1 the NMI watchdog uses the programmable interval timer >>to trigger interrupt events via the IOAPIC. with nmi_watchdog=2 we use the >>performance counters on the processor to trigger these events. IOAPICs >>are generally found on SMP motherboards (but there are UP boards with >>them, it's chipset dependent). Generally i686+ (save some Athlons and a >>few other processors) will work with nmi_watchdog=2. > > > Forgot this bit; > > w/ CONFIG_X86_LOCAL_APIC=y you only have nmi_watchdog=2 > > w/ CONFIG_X86_IO_APIC=y you have nmi_watchdog=1 and 2 > > w/ CONFIG_SMP you have nmi_watchdog=1 and 2 as it depends on > CONFIG_X86_IO_APIC Marc-Christian Petersen wrote: > the nmi_watchdog is always compiled in if you select "CONFIG_X86_LOCAL_APIC" > > see "arch/i386/kernel/Makefile" Thanks to all who responded. I will prepare a patch for Documentation/nmi_watchdog.txt to clarify it and send the patch to Linus and Marcelo. Regards, Carl-Daniel -- http://www.hailfinger.org/