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

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Message-ID: <29111.1264024681@neuling.org>
Date:	Thu, 21 Jan 2010 10:58:01 +1300
From:	Michael Neuling <mikey@...ling.org>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Joel Schopp <jschopp@...tin.ibm.com>, ego@...ibm.com,
	Andreas Herrmann <andreas.herrmann3@....com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/2] powerpc: implement arch_scale_smt_power for Power7

> > 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.  
> 
> So this is an actual performance improvement, not only power savings?

It's primarily a performance improvement.  Any power/energy savings
would be a bonus.  

Mikey
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