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

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Message-ID: <2103936926.165868.1322395032341.JavaMail.mail@webmail17>
Date:	Sun, 27 Nov 2011 11:57:12 +0000 (GMT)
From:	"Artem S. Tashkinov" <t.artem@...os.com>
To:	rjw@...k.pl
Cc:	tino.keitel@...ei.de, linux-kernel@...r.kernel.org
Subject: Re: Re: [REGRESSION] [Linux 3.2] top/htop and all other CPU usage
 metering applications has gone crackers

> On Nov 27, 2011, Rafael J. Wysocki <rjw@...k.pl> 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 2500, i686

Best wishes,

Artem
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