linux-kernel - Re: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86 platform

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Message-ID: <20091201021459.43d2142a@infradead.org>
Date:	Tue, 1 Dec 2009 02:14:59 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Ma, Ling" <ling.ma@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Dave Jones <davej@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86
 platform

On Tue, 1 Dec 2009 16:54:04 +0800
"Ma, Ling" <ling.ma@...el.com> wrote:

> Hi Ingo
> 
> Thanks for your correction, so we use perf stat --repeat 3 to test
> volano, tbench, and kbuild, Because netperf has multiple items we may
> send out later.

a key question is.. how much more memory do you have free due to -Os?
(because memory is cache is performance on a system level as well)
and how much less icache pressure is there?


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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