linux-kernel - Re: [PATCHv3 2/2] powerpc: implement arch_scale_smt

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Message-ID: <20100129122536.GA11156@iram.es>
Date:	Fri, 29 Jan 2010 13:25:36 +0100
From:	Gabriel Paubert <paubert@...m.es>
To:	Joel Schopp <jschopp@...tin.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, ego@...ibm.com,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCHv3 2/2] powerpc: implement arch_scale_smt_power for
	Power7

On Thu, Jan 28, 2010 at 05:20:55PM -0600, Joel Schopp wrote:
> On Power7 processors running in SMT4 mode with 2, 3, or 4 idle threads 
> there is performance benefit to idling the higher numbered threads in
> the core.  
> 

Really 2, 3, or 4? When you have 4 idle threads out of 4, performance
becomes a minor concern, no? ;-)

	Gabriel
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