linux-kernel - Re: [patch] Performance Counters for Linux, v2

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Date:	Mon, 08 Dec 2008 15:41:57 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephane Eranian <eranian@...glemail.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Robert Richter <robert.richter@....com>,
	Arjan van de Veen <arjan@...radead.org>,
	Peter Anvin <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [patch] Performance Counters for Linux, v2

Ingo Molnar <mingo@...e.hu> writes:

> This means that the only correct technical/mathematical argument is to 
> talk about "levels of noise" and how they compare and correlate - and 
> i've seen no actual measurements or estimations pro or contra. Group 
> readout of counters can reduce noise for sure, but it is wrong for you to 
> try to turn this into some sort of all-or-nothing property. Other sources 
> of noise tend to be of much higher of magnitude.

Ingo, could you please describe how PEBS and IBS fit into your model?

Thanks.

-Andi

-- 
ak@...ux.intel.com
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