lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 17 Nov 2010 18:33:02 -0500 From: Steven Rostedt <rostedt@...dmis.org> To: David Sharp <dhsharp@...gle.com> Cc: Douglas Santos <douglas.santos@...ymtl.ca>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "ltt-dev@...ts.casi.polymtl.ca" <ltt-dev@...ts.casi.polymtl.ca>, 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 15:22 -0800, David Sharp wrote: > On Wed, Nov 17, 2010 at 2:56 PM, Douglas Santos > <douglas.santos@...ymtl.ca> wrote: > > Quoting Steven Rostedt <rostedt@...dmis.org>: > >> 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, can you explain how you're drawing that conclusion? Did Douglas > run this benchmark before on a previous kernel (I didn't see it if > so)? Oops, no, I was thinking that this was from your tests. I remember asking you to try the new kernel. I think I got you and Douglas confused :-) -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists