From: Andi Kleen <andi@firstfloor.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
linux-arch@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Stephane Eranian <eranian@googlemail.com>,
Eric Dumazet <dada1@cosmosbay.com>,
Robert Richter <robert.richter@amd.com>,
Arjan van de Veen <arjan@infradead.org>,
Peter Anvin <hpa@zytor.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Steven Rostedt <rostedt@goodmis.org>,
David Miller <davem@davemloft.net>
Subject: Re: [patch] Performance Counters for Linux, v2
Date: Mon, 08 Dec 2008 15:41:57 +0100 [thread overview]
Message-ID: <87k5aan2yy.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20081208113318.GA14723@elte.hu> (Ingo Molnar's message of "Mon, 8 Dec 2008 12:33:18 +0100")
Ingo Molnar <mingo@elte.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@linux.intel.com
next prev parent reply other threads:[~2008-12-08 14:41 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-08 1:22 [patch] Performance Counters for Linux, v2 Ingo Molnar
2008-12-08 1:49 ` Arjan van de Ven
2008-12-08 11:49 ` Ingo Molnar
2009-01-07 7:43 ` Zhang, Yanmin
2009-01-09 1:07 ` Zhang, Yanmin
2008-12-08 3:24 ` Paul Mackerras
2008-12-08 11:33 ` Ingo Molnar
2008-12-08 12:02 ` David Miller
2008-12-08 14:41 ` Andi Kleen [this message]
2008-12-08 22:03 ` Paul Mackerras
2008-12-09 13:00 ` Ingo Molnar
2008-12-09 23:00 ` Paul Mackerras
2008-12-08 8:32 ` Corey J Ashford
2008-12-09 6:37 ` stephane eranian
2008-12-09 11:02 ` Ingo Molnar
2008-12-09 11:11 ` David Miller
2008-12-09 11:22 ` Ingo Molnar
2008-12-09 11:29 ` David Miller
2008-12-09 12:14 ` Paolo Ciarrocchi
2008-12-09 13:46 ` Ingo Molnar
2008-12-09 16:39 ` Chris Friesen
2008-12-09 19:02 ` Ingo Molnar
2008-12-09 19:51 ` Chris Friesen
2008-12-09 16:46 ` Will Newton
2008-12-09 17:35 ` Chris Friesen
2008-12-09 21:16 ` stephane eranian
2008-12-09 21:16 ` stephane eranian
2008-12-09 22:19 ` Paul Mackerras
2008-12-09 22:40 ` Andi Kleen
2008-12-10 4:44 ` Paul Mackerras
2008-12-10 5:03 ` stephane eranian
2008-12-10 10:26 ` Andi Kleen
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