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

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Message-ID: <20090504131457.GA25844@elte.hu>
Date:	Mon, 4 May 2009 15:14:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tobias Doerffel <tobias.doerffel@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Willy Tarreau <w@....eu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>,
	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


* 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.

	Ingo
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