Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263568AbTKXBKO (ORCPT ); Sun, 23 Nov 2003 20:10:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263570AbTKXBKO (ORCPT ); Sun, 23 Nov 2003 20:10:14 -0500 Received: from dp.samba.org ([66.70.73.150]:53697 "EHLO lists.samba.org") by vger.kernel.org with ESMTP id S263568AbTKXBKL (ORCPT ); Sun, 23 Nov 2003 20:10:11 -0500 Date: Mon, 24 Nov 2003 12:06:12 +1100 From: Anton Blanchard To: Nick Piggin Cc: linux-kernel , "Martin J. Bligh" , Andi Kleen , Ingo Molnar , Andi Kleen , Con Kolivas , Andrew Morton , jbarnes@sgi.com, efocht@hpce.nec.com, John Hawkes , wookie@osdl.org Subject: Re: [RFC] generalise scheduling classes Message-ID: <20031124010612.GB6537@krispykreme> References: <20031118173607.GA88556@colin2.muc.de> <20031118235710.GA10075@colin2.muc.de> <3FBAF84B.3050203@cyberone.com.au> <501330000.1069443756@flay> <3FBF099F.8070403@cyberone.com.au> <1010800000.1069532100@[10.10.2.4]> <3FC01817.3090705@cyberone.com.au> <3FC0A0C2.90800@cyberone.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3FC0A0C2.90800@cyberone.com.au> User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 871 Lines: 22 > We still don't have an HT aware scheduler, which is unfortunate because > weird stuff like that looks like it will only become more common in > future. Yep. Look at POWER5, 2 cores on a die sharing a l2 cache and 2 threads on each core. On top of that you have the higher level NUMA characteristics of the machine. So we need SMT as well as (potentially) 2 levels of NUMA. The overhead of enabling multi levels of NUMA may outweigh the gains, we need to do some analysis. Looks like a lot of the other architectures are going multi core multi thread... (HT is an intel trademark for what boils down to being SMT) Anton - 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/