linux-kernel - Re: v2.6.26-rc7: Negative powertop values

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080706194845.GA5617@ucw.cz>
Date:	Sun, 6 Jul 2008 21:48:45 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Vegard Nossum <vegard.nossum@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: v2.6.26-rc7: Negative powertop values

On Sat 2008-06-21 14:16:15, Arjan van de Ven wrote:
> On Sat, 21 Jun 2008 21:16:37 +0200
> "Vegard Nossum" <vegard.nossum@...il.com> wrote:
> 
> > Hi,
> > 
> > I was testing v2.6.26-rc7 by running lmbench and hotplug/-unplugging
> > CPUs and a few other programs at the same time. Powertop was showing a
> > negative number of wakeups/second and average C3 residency was
> > something really insane. Is there anything strange with this schedstat
> > file, or is there another file I should look at that can explain the
> > strange powertop numbers? Or maybe it's just an artifact of powertop
> > and this has nothing to do with the kernel?
> 
> powertop doesn't assume you do cpu hotunplug (and the internal state
> goes wacky if you do).
> 
> [I assume you know that doing a software unplug you burn more power
> than by leaving the cpu idle]

We should really fix that one day...
							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/