linux-kernel - Re: Benchmarks of kernel tracing options 2 (ftrace, lttng and perf)

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Message-ID: <1290030106.30543.74.camel@gandalf.stny.rr.com>
Date:	Wed, 17 Nov 2010 16:41:46 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Douglas Santos <douglas.santos@...ymtl.ca>
Cc:	linux-kernel@...r.kernel.org, ltt-dev@...ts.casi.polymtl.ca,
	David Sharp <dhsharp@...gle.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Rubin <mrubin@...gle.com>
Subject: Re: Benchmarks of kernel tracing options 2 (ftrace, lttng and perf)

On Wed, 2010-11-17 at 16:31 -0500, Douglas Santos wrote:
> Hi all,
> 
> This is a response to a benchmark, submitted a few weeks ago, comparing kernel
> tracing options.
> http://lkml.org/lkml/2010/10/28/422
> 
> We followed the methodology described in the link bellow,
> but using the shellscripts posted there to reproduce autotest scripts.
> http://lkml.org/lkml/2010/10/28/261
> 
> We disabled the extra syscall tracing on lttng, for a fair comparison.
> http://lkml.org/lkml/2010/10/28/290
> 
> Average results with tracing "on":
> 
> lttng:  220 ns
> ftrace: 260 ns

Heh, so ftrace got worse with the new kernel?

-- Steve

> perf:   740 ns
> 
> 
> E5405 system
> kernel 2.6.36
> 
> -lttng 0.239 + 0.19.2modules + sys_getuid tracepoint + sys_getuid probe
>  + remove syscall_trace
> 
> -ftrace and perf + sys_getuid tracepoint


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