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

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Message-ID: <20110308161524.GE1751@elte.hu>
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
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