linux-kernel - Re: Bug: 2.6.15 Process accounting fails to account for small time slice loads (still)

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Message-ID: <Pine.LNX.4.63.0701302156050.15094@gockel.physik3.uni-rostock.de>
Date:	Tue, 30 Jan 2007 22:13:39 +0100 (CET)
From:	Tim Schmielau <tim@...sik3.uni-rostock.de>
To:	Tom Burns <tom.i.burns@...il.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: Bug: 2.6.15 Process accounting fails to account for small time
 slice loads (still)

On Tue, 30 Jan 2007, Tom Burns wrote:

> That would be great if you could find that patch - I can worry about
> porting it to the current kernel.  We're having an issue where our
> device, while routing large amounts of network traffic, reports 0% CPU
> utilisation when it cannot be the case, and I think this is the cause.

Here is one patch for CPU cycle accounting: (although I'm not sure that's 
really the one I had in mind)

  http://lkml.org/lkml/2004/6/23/78

It might also be worth having a look at oprofile:

  http://oprofile.sourceforge.net/

If you are on IA64 or PPC rather than i386, ppacc might help you:

  http://lkml.org/lkml/2006/1/13/308
  http://ppacc.sourceforge.net/about.html

Although I'd guess you are not on PPC or S390 as these already to correct 
CPU cycle accounting (IIRC).

Hope that helps,
Tim
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