linux-kernel - Re: [REGRESSION] [Linux 3.2] top/htop and all other CPU usage metering applications has gone crackers

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: <201111271256.18091.rjw@sisk.pl>
Date:	Sun, 27 Nov 2011 12:56:17 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Tino Keitel <tino.keitel@...ei.de>
Cc:	linux-kernel@...r.kernel.org,
	"Artem S. Tashkinov" <t.artem@...os.com>
Subject: Re: [REGRESSION] [Linux 3.2] top/htop and all other CPU usage metering applications has gone crackers

On Sunday, November 27, 2011, Tino Keitel wrote:
> On Sun, Nov 27, 2011 at 12:45:57 +0100, Rafael J. Wysocki wrote:
> > On Sunday, November 27, 2011, Tino Keitel wrote:
> > > On Thu, Nov 24, 2011 at 21:05:53 +0100, Tino Keitel wrote:
> > > > On Thu, Nov 24, 2011 at 10:30:15 +0000, Artem S. Tashkinov wrote:
> > > > > Hello,
> > > > > 
> > > > > I'd like to report a weird regression in Linux 3.2 (running rc3 now) - all CPU metering applications have gone terribly mad
> > > > > under this kernel:
> > > > 
> > > > I get the same using top, htop and the gnome system monitor with kernel
> > > > 3.2 on a Sandy Bridge quad core box, running Debian unstable.
> > > 
> > > I just tested 3.2-rc2, and see the same bug.
> > 
> > I'm seeing that too on one of my test boxes, but not all the time
> > (i.e. there are periods in which the readings are correct).  The other boxes
> > I've tested with 3.2-rc are fine in that respect.
> > 
> > Also, it seems that it shows 100%-(real load) when it is wrong.  So, it looks
> > like there's an overflow somewhere in the CPU load measuring code, at least
> > on some CPUs.
> > 
> > What's your CPU, BTW?
> 
> Intel Core i5-2400

The CPU I'm seeing the problem with is AMD Athlon X2 3800+.

Thanks,
Rafael
--
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/