linux-kernel - Re: power management regression in linux 3.10? (related to CONFIG_NO_HZ

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Message-ID: <1906476.HVJCZCXmXX@vostro.rjw.lan>
Date:	Tue, 04 Jun 2013 13:30:54 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Michael Karcher <Michael.Karcher@...berlin.de>
Cc:	Dirk Brandewie <dirk.brandewie@...il.com>,
	linux-pm@...r.kernel.org, Len Brown <len.brown@...el.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: power management regression in linux 3.10? (related to CONFIG_NO_HZ_FULL)

On Tuesday, June 04, 2013 03:08:48 AM Michael Karcher wrote:
> Am Montag, den 03.06.2013, 12:37 -0700 schrieb Dirk Brandewie:
> > On 06/03/2013 12:34 PM, Rafael J. Wysocki wrote:
> > > On Monday, June 03, 2013 07:56:15 PM Michael Karcher wrote:
> > >> Hello,
> > > Yes, please try with CONFIG_NO_HZ_IDLE and see if you can reproduce the
> > > problem.
> Instead of doing that, I successfully applied Dirk's suggestion. Is
> CONFIG_NO_HZ + CONFIG_NO_HZ_IDLE worth testing?

Yes, it is.

> > > Does your system use intel_idle?  You've set that in .config, but can you check
> > > what dmesg says, please?
> No, intel_idle complains it doesn't support my CPU family.

I thought so.  It is using the ACPI idle driver, then, so I think cpuidle in
general is affected.

That seems to be a time accounting problem of some sort (adding CCs to Ingo and
Thomas).

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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