linux-kernel - Re: [Suggestion] [x86]: Compiler Option Os is better on latest x86

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Message-ID: <20130124144612.GC13471@pd.tnic>
Date:	Thu, 24 Jan 2013 15:46:12 +0100
From:	Borislav Petkov <bp@...e.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	ling.ma.program@...il.com, mingo@...hat.com, tglx@...utronix.de,
	hpa@...or.com, linux-kernel@...r.kernel.org,
	Ma Ling <ling.ml@...pay.com>
Subject: Re: [Suggestion] [x86]: Compiler Option Os is better on latest x86

On Thu, Jan 24, 2013 at 03:17:33PM +0100, Ingo Molnar wrote:
> > So our initial conclusion is Os is better than O2 for current 
> > & coming x86 CPUs. If I was wrong, please correct me.
> 
> Did you patch the kernel, or used CONFIG_CC_OPTIMIZE_FOR_SIZE?
> 
> (there was no patch in your mail.)

Hmm, I'm not sure about -Os: 3a55fb0d9fe8e2f4594329edd58c5fd6f35a99dd

And 0.01/0.03 IPC improvement doesn't really look too persuasive IMO.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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