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Date: Mon, 4 May 2009 15:14:57 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Tobias Doerffel <tobias.doerffel@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Willy Tarreau <w@1wt.eu>,
       Thomas Gleixner <tglx@linutronix.de>,
       Arjan van de Ven <arjan@infradead.org>,
       Suresh Siddha <suresh.b.siddha@intel.com>,
       "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: Specific support for Intel Atom architecture
Message-ID: <20090504131457.GA25844@elte.hu>
References: <200904301408.09370.tobias.doerffel@gmail.com> <20090503053821.GI570@1wt.eu> <49FD3E56.3010803@zytor.com> <200905031308.51316.tobias.doerffel@gmail.com>
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* Tobias Doerffel <tobias.doerffel@gmail.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