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

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Date:	Tue, 28 Aug 2007 22:00:14 +0900
From:	"Akinobu Mita" <akinobu.mita@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Pavel Machek" <pavel@....cz>,
	"Jeff Chua" <jeff.chua.linux@...il.com>, vatsa@...ibm.com,
	zwane@....linux.org.uk,
	"kernel list" <linux-kernel@...r.kernel.org>, satyam@...radead.org,
	ashok.raj@...el.com, ego@...ibm.com, rusty@...tcorp.com.au
Subject: Re: cpu hotplug support broken in 2.6.23-rc3

2007/8/28, Rafael J. Wysocki <rjw@...k.pl>:
> On Monday, 27 August 2007 23:58, Pavel Machek wrote:
> > On Mon 2007-08-27 23:59:31, Rafael J. Wysocki wrote:
> > > On Monday, 27 August 2007 23:32, Pavel Machek wrote:
> > > > On Mon 2007-08-27 22:36:57, Jeff Chua wrote:
> > > > > On 8/27/07, Pavel Machek <pavel@....cz> wrote:
> > > > > > On Mon 2007-08-27 12:43:50, Pavel Machek wrote:
> > > > > > > Hi!
> > > > > > >
> > > > > > > Trying to do few onlines/offlines reliably hangs my machine (thinkpad
> > > > > > > x60, i386 architecture).
> > > > >
> > > > > I just 3 cycles of on-line/off-line on 2.6.23-rc3 on ThinkPad x60s,
> > > > > and my system still survives.
> > > >
> > > > Can you try 20-or-so tests? Mine hangs randomly, so it survived 4 or
> > > > so cycles at one point.
> > > >
> > > > ...or maybe difference is in the .config, or maybe I broken something
> > > > in my kernel sources....

I have been doing enough CPU offline/online test these days and it works fine.
But there is no cpufreq driver which supports my machine. So my test didn't
cover test cpu hotplug code in cpufreq.

If you have cpufreq driver and it is built as module, it is worth trying
same test after unloading cpufreq driver in order to narrow down the problem
area.
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