{"id":14653,"date":"2013-12-12T19:37:39","date_gmt":"2013-12-12T19:37:39","guid":{"rendered":"http:\/\/www.beautifulwork.org\/?p=14653"},"modified":"2013-12-12T19:37:39","modified_gmt":"2013-12-12T19:37:39","slug":"parameter-watchdog","status":"publish","type":"post","link":"https:\/\/www.trueangle.org\/index.php\/2013\/12\/12\/parameter-watchdog\/","title":{"rendered":"What is nmi_watchdog related to Linux ?"},"content":{"rendered":"

ABOUT NMI<\/u><\/p>\n

\nShort for non-maskable interrupt, NMI is the highest priority interrupt capable of interrupting all\nsoftware and non-vital hardware devices. The NMI is not commonly used and usually only used to verify if\na serious error has occurred or stop all operations because of a failure. For example, when you press\nCtrl+Alt+Del when the computer freezes or stops responding an NMI is sent to the CPU.\n<\/pre>\n
ABOUT    watchdog<\/u><\/p>\n
\nA watchdog in computer terms is something, usually hardware-based, that monitors a complex system for\n\u201cnormal\u201d behaviour and if it fails, performs a system reset to hopefully recover normal operation.\n<\/pre>\n
ABOUT nmi_watchdog<\/u><\/p>\n
\nEnables\/Disables the NMI watchdog on x86 systems. When the value is non-zero the NMI watchdog is enabled\nand will continuously test all online cpus to determine whether or not they are still functioning\nproperly. Currently, passing \"nmi_watchdog=\" parameter at boot time is required for this function to work.\n\nIf LAPIC NMI watchdog method is in use (nmi_watchdog=2 kernel parameter), the NMI watchdog shares\nregisters with oprofile. By disabling the NMI watchdog, oprofile may have more registers to\nutilize.\n<\/pre>\n
TYPICAL SHELL SESSION RELATED<\/u>
\n[bash]
\nroot>pwd
\n\/proc\/sys\/kernel
\nroot>cat nmi_watchdog
\n1
\nroot>cat \/proc\/sys\/kernel\/nmi_watchdog
\n1
\nroot>
\n[\/bash]<\/p>\n
A PART OF A TYPICAL COMMAND IS SHOWN<\/u>
\n[bash]
\n$apt-cache show freeipmi-bmc-watchdog
\nPackage: freeipmi-bmc-watchdog
\nSource: freeipmi
\nVersion: 1.5.7-2.1
\nInstalled-Size: 152
\nMaintainer: Debian FreeIPMI Maintainers <pkg-freeipmi-devel@lists.alioth.debian.org>
\nArchitecture: amd64
\nDepends: libc6 (>= 2.14), libfreeipmi17 (>= 1.1.5), libgcrypt20 (>= 1.7.0), freeipmi-common (= 1.5.7-2.1), freeipmi-tools
\nPre-Depends: dpkg (>= 1.15.7.2~)
\nDescription-en: GNU implementation of the IPMI protocol – BMC watchdog
\n FreeIPMI is a collection of Intelligent Platform Management IPMI
\n system software. It provides in-band and out-of-band software and a
\n development library conforming to the Intelligent Platform Management
\n Interface (IPMI v1.5 and v2.0) standards.
\n .
\n This package contains a watchdog daemon for hardware BMC watchdogs.
\nDescription-md5: de829f061dc1ffe58f7abb1eed647eb0
\nHomepage: http:\/\/www.gnu.org\/software\/freeipmi\/
\nTag: implemented-in::c, role::program
\nSection: admin
\nPriority: optional
\nFilename: pool\/main\/f\/freeipmi\/freeipmi-bmc-watchdog_1.5.7-2.1_amd64.deb
\nSize: 43524
\nMD5sum: 88b812dd810689b59fd0d35063e1af49
\nSHA256: 763d3bd2f55d804487e1ab9b77fecd5087e826089c5083c10736982d093dafd9
\n[\/bash]<\/p>\n
LINKS
\nhttps:\/\/www.kernel.org\/doc\/Documentation\/watchdog\/watchdog-api.txt<\/a>
\nhttp:\/\/www.sat.dundee.ac.uk\/~psc\/watchdog\/watchdog-background.html<\/a>
\nhttps:\/\/www.computerhope.com\/jargon\/n\/nmi.htm<\/a>
\nhttps:\/\/www.gnu.org\/software\/freeipmi\/index.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
ABOUT NMI Short for non-maskable interrupt, NMI is the highest priority interrupt capable of interrupting all software and non-vital hardware devices. The NMI is not commonly used and usually only used to verify if a serious error has occurred or stop all operations because of a failure. For example, when you press Ctrl+Alt+Del when the … <\/p>\n
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