From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id B6BD71007E0 for ; Thu, 19 May 2011 07:54:56 +1000 (EST) Subject: Re: [PATCH 6/7] powerpc/mm: 64-bit: tlb handler micro-optimization From: Benjamin Herrenschmidt To: Scott Wood In-Reply-To: <20110518165134.1023dccc@schlenkerla.am.freescale.net> References: <20110518210536.GE29524@schlenkerla.am.freescale.net> <1305754667.7481.5.camel@pasglop> <20110518165134.1023dccc@schlenkerla.am.freescale.net> Content-Type: text/plain; charset="UTF-8" Date: Thu, 19 May 2011 07:54:48 +1000 Message-ID: <1305755688.7481.12.camel@pasglop> Mime-Version: 1.0 Cc: linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, 2011-05-18 at 16:51 -0500, Scott Wood wrote: > On Thu, 19 May 2011 07:37:47 +1000 > Benjamin Herrenschmidt wrote: > > > On Wed, 2011-05-18 at 16:05 -0500, Scott Wood wrote: > > > A little more speed up measured on e5500. > > > > > > Setting of U0-3 is dropped as it is not used by Linux as far as I can > > > see. > > > > Please keep them for now. If your core doesn't have them, make them an > > MMU feature. > > We have them, it was just an attempt to clean out unused things to speed up > the miss handler. I'll drop that part if you think we'll use it in the > future. I never know for sure ... damn research people ... :-) I'd rather keep them for now, does it make a significant difference ? Cheers, Ben.