linux-kernel - Re: high %CPU values after upgrading to the last stable kernel

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Message-Id: <200810230155.48344.alistair@devzero.co.uk>
Date:	Thu, 23 Oct 2008 01:55:48 +0100
From:	Alistair John Strachan <alistair@...zero.co.uk>
To:	"Ray Lee" <ray-lk@...rabbit.org>
Cc:	"Frédéric Weisbecker" <fweisbec@...il.com>,
	sbs <gexlie@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: high %CPU values after upgrading to the last stable kernel

On Wednesday 22 October 2008 23:40:54 Ray Lee wrote:
> On Wed, Oct 22, 2008 at 2:04 PM, Frédéric Weisbecker <fweisbec@...il.com> 
wrote:
> > 2008/10/22 sbs <gexlie@...il.com>:
[snip]
> >> should i upgrade procps or downgrade kernel then to get proper values
> >> back? :) or is it a feature of the new kernel?
> >>
> >> thank you
> >
> > Hi,
> >
> > It really depends on what your box is doing at the time you capture
> > the cpu usage.
> > And it really depends too of your kernel config...
>
> It really shouldn't, we're talking about /proc which is supposed to be
> a stable userspace interface.
>
> Try upgrading your procps, there's a chance it's just so ancient that
> it accidentally got broken. However, if that fixes your problem, then
> please report back with a subject line of "/proc API breakage" or
> somesuch, to get the proper attention to the issue.

This is a known kernel bug that for some reason wasn't fixed before 2.6.27 was 
released. See http://bugzilla.kernel.org/show_bug.cgi?id=11209 for details.

It would probably be useful if the OP added himself to the CC list, so Peter 
can get some more details about the box.

-- 
Cheers,
Alistair.
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