linux-kernel - Re: [PATCH 1/2] x86: separating entry text section

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 8 Mar 2011 17:15:24 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	masami.hiramatsu.pt@...achi.com, hpa@...or.com, ananth@...ibm.com,
	davem@...emloft.net, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, eric.dumazet@...il.com,
	2nddept-manager@....hitachi.co.jp
Subject: Re: [PATCH 1/2] x86: separating entry text section


* Jiri Olsa <jolsa@...hat.com> wrote:

> On Mon, Mar 07, 2011 at 04:29:21PM +0100, Ingo Molnar wrote:
> > 
> > * Jiri Olsa <jolsa@...hat.com> wrote:
> > 
> > > hi,
> > > any feedback?
> > 
> > Did you get my reply below?
> > 
> > Thanks,
> > 
> > 	Ingo
> > 
> 
> hi,
> 
> strange, I believe I did reply on this.. got missed
> somehow or I'm missing simething :) reattached..

hm, the direct mail to me got lost, but i found your reply in the lkml folder. 
That's how i missed your reply.

> I made another test with "reseting" the system state as suggested and only for 
> cache-misses together with instructions and cycles events.
> 
> I can see even bigger drop of icache load misses than before
> from 19359739 to 16448709 (about 15%).
> 
> The instruction/cycles count is slightly bigger in the patched
> kernel run though..

Ok, elapsed time is more stable, it went from:

>         0.205402048  seconds time elapsed   ( +-   0.299% )
>         0.206267711  seconds time elapsed   ( +-   0.138% )

to:

>         0.206072845  seconds time elapsed   ( +-   0.276% )
>         0.206747566  seconds time elapsed   ( +-   0.137% )

which is 0.1% slower, within the noise of the measurement.

Will apply the patches, thanks Jiri!

Thanks,

	Ingo
--
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/