Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754793Ab0A2MnT (ORCPT ); Fri, 29 Jan 2010 07:43:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754495Ab0A2MnS (ORCPT ); Fri, 29 Jan 2010 07:43:18 -0500 Received: from gra-lx1.iram.es ([150.214.224.41]:49077 "EHLO gra-lx1.iram.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754220Ab0A2MnS (ORCPT ); Fri, 29 Jan 2010 07:43:18 -0500 X-Greylist: delayed 1045 seconds by postgrey-1.27 at vger.kernel.org; Fri, 29 Jan 2010 07:43:18 EST Date: Fri, 29 Jan 2010 13:25:36 +0100 From: Gabriel Paubert To: Joel Schopp Cc: Peter Zijlstra , ego@in.ibm.com, linux-kernel@vger.kernel.org, Ingo Molnar , linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCHv3 2/2] powerpc: implement arch_scale_smt_power for Power7 Message-ID: <20100129122536.GA11156@iram.es> References: <1264017638.5717.121.camel@jschopp-laptop> <1264017847.5717.132.camel@jschopp-laptop> <1264548495.12239.56.camel@jschopp-laptop> <1264720855.9660.22.camel@jschopp-laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1264720855.9660.22.camel@jschopp-laptop> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 583 Lines: 15 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/