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Nortel PatchNortel PatchPosted Apr 13, 2008 20:29 UTC (Sun) by Felix_the_Mac (guest, #32242)Parent article: Notes from the Collaboration Summit
A couple of articles about the summit (such as this one http://news.yahoo.com/s/cmp/20080410/tc_cmp/207100528) mention a patch from Nortel for restarting a crashed system. Do anyone have any links to more info about this? Thanks
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Nortel Patch Posted Apr 17, 2008 7:30 UTC (Thu) by mingo (subscriber, #31122) [Link] the observation is correct - automatic reboot upon lockups is not possible in Linux yet. The soft-lockup detector looks like the logical place to put this feature. I have whipped up a patch for this and have queued it up for v2.6.26: http://redhat.com/~mingo/softlockup-patches/softlockup-al... it adds softlockup_panic=1 boot option, a /proc/sys/kernel/softlockup_panic sysctl, and a CONFIG_SOFTLOCKUP_PANIC=y .config option - whichever is the most convenient to use. this feature should be used in conjunction with panic_timeout=2, so that every panic reboots the box after two seconds. Probably /proc/sys/kernel/softlockup_thresh should be decreased as well to 10 seconds (down from the default 60 seconds) - so the combined reboot delay should be 12 seconds. (Note: the feature will be default-available on all default kernel builds, but the sysctl will default to off. I.e. the config option influences the value of the default, not the availability of the feature.)
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