linux-kernel - Re: Specific support for Intel Atom architecture

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Message-ID: <20090504063258.00d035b2@infradead.org>
Date:	Mon, 4 May 2009 06:32:58 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Tobias Doerffel <tobias.doerffel@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Willy Tarreau <w@....eu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Specific support for Intel Atom architecture

On Mon, 4 May 2009 15:14:57 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Tobias Doerffel <tobias.doerffel@...il.com> wrote:
> 
> > Am Sonntag, 3. Mai 2009 08:48:54 schrieb H. Peter Anvin:
> > > Willy Tarreau wrote:
> > > >> $(call cc-option,-march=atom,-march=i686)
> > > >
> > > > if it's an in-order architecture, wouldn't it be better to tune
> > > > for i386 or i486 instead ?
> > >
> > > Possibly.  It would be worth measuring.
> >
> > How would one do that (never benchmarked kernel stuff before)?
> 
> A standard method is to run lmbench and compare the results - 
> lmbench has a built-in 'report comparison between two runs' feature.

well... you're normally REALLY hard pressed to measure compiler
differences this way..... 

normally compiler options get benchmarked using speccpu and the like....


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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