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Date: Tue, 4 Sep 2007 09:27:44 +0200 From: Pavel Machek <pavel@....cz> To: Thomas Gleixner <tglx@...utronix.de> Cc: "Rafael J. Wysocki" <rjw@...k.pl>, Jeff Chua <jeff.chua.linux@...il.com>, rusty@...tycorp.com.au, vatsa@...ibm.com, zwane@....linux.org.uk, kernel list <linux-kernel@...r.kernel.org> Subject: Re: cpu hotplug support broken in 2.6.23-rc3 > On Mon, 2007-09-03 at 12:19 +0200, Rafael J. Wysocki wrote: > > > Ok, so it gets weirder. I have now machine in "hung" state; other > > > consoles still work, but there are no timers - sleep 1 hangs forever. > > > > > > sysrq-t shows kstopmachine hung in hrtimer_try_to_cancel. > > > > > > So I indeed suspect difference-in-kconfig to trigger this, and will > > > try disabling noidlehz. > > > > I would unset CONFIG_HIGH_RES_TIMERS for starters. > > > > Well, I guess Thomas should know about that. ;-) > > What was the last known to work version ? I'm afraid I only turned on HIGH_RES_TIMERS in 2.6.23-rc1 timeframe... so I'm not sure if it ever worked for me. I can confirm it is working in 2.6.23-rc5 with highres disabled, and broken with highres enabled. NOHZ turns "waits for keypress during unplug/replug" into "just plain hangs". Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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