linux-kernel - Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

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Message-ID: <450C3A98.4060704@opersys.com>
Date:	Sat, 16 Sep 2006 13:55:36 -0400
From:	Karim Yaghmour <karim@...rsys.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC:	Jes Sorensen <jes@....com>, Ingo Molnar <mingo@...e.hu>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Andrew Morton <akpm@...l.org>, tglx@...utronix.de,
	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Tom Zanussi <zanussi@...ibm.com>, ltt-dev@...fik.org,
	Michel Dagenais <michel.dagenais@...ymtl.ca>
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108


Mathieu Desnoyers wrote:
> The bottom line is :
> 
> LTTng impact on the studied phenomenon : 35% slower
> 
> LTTng+kprobes impact on the studied phenomenon : 73% slower
> 
> Therefore, I conclude that on this type of high event rate workload, kprobes
> doubles the tracer impact on the system.

Amen to that. Hopefully this puts to rest the myth of Mr. Scrub.

Karim
-- 
President  / Opersys Inc.
Embedded Linux Training and Expertise
www.opersys.com  /  1.866.677.4546
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