linux-kernel - Re: cpu hotplug support broken in 2.6.23-rc3

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Message-ID: <20070904072744.GA30474@atrey.karlin.mff.cuni.cz>
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
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