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

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Date:	Mon, 18 Sep 2006 11:01:15 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Jes Sorensen <jes@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, Roman Zippel <zippel@...ux-m68k.org>,
	Andrew Morton <akpm@...l.org>, tglx@...utronix.de,
	karim@...rsys.com, 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

* Jes Sorensen (jes@....com) wrote:
> 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.
> 
> For this specific benchmark, for which we have not seen the code, nor
> do we know what system configuration it was run on. Sorry, but even M$'s
> sham benchmarks generally tell you which system they used for their
> tests.
> 
> In addition, some profiling would be interesting so we can see exactly
> where things go wrong and fix it. Ingo seems to be doing a good job at
> that even without you providing this basic info....
> 

Hi Jes,

I did not repeat my system configuration from the previous email in the thread
as it seemed redundant. Ingo asked me politely to tell more about my config
and tests, which I have done. Please read on further down this thread to get
that information.

Mathieu

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