Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757441AbYKDVyV (ORCPT ); Tue, 4 Nov 2008 16:54:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756630AbYKDVxR (ORCPT ); Tue, 4 Nov 2008 16:53:17 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:34372 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754274AbYKDVxP (ORCPT ); Tue, 4 Nov 2008 16:53:15 -0500 Date: Tue, 4 Nov 2008 22:52:45 +0100 From: Ingo Molnar To: "H. Peter Anvin" Cc: Alexander van Heukelum , Andi Kleen , Cyrill Gorcunov , Alexander van Heukelum , LKML , Thomas Gleixner , lguest@ozlabs.org, jeremy@xensource.com, Steven Rostedt , Mike Travis Subject: Re: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes Message-ID: <20081104215245.GC17775@elte.hu> References: <20081104122839.GA22864@mailshack.com> <20081104150729.GC21470@localhost> <20081104170501.GE29626@one.firstfloor.org> <1225822006.21441.1282961299@webmail.messagingengine.com> <20081104204400.GC10825@elte.hu> <20081104212933.GA11050@elte.hu> <4910C014.9070805@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4910C014.9070805@zytor.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00,DNS_FROM_SECURITYSAGE autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] 0.0 DNS_FROM_SECURITYSAGE RBL: Envelope sender in blackholes.securitysage.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 960 Lines: 30 * H. Peter Anvin wrote: > Ingo Molnar wrote: > > * Ingo Molnar wrote: > > > >> And as hpa's comments point it out, compressing the rather stupid > >> irq stubs might be a third option that looks promising as well. > > > > ... and we should try and see how far we can compress those stubs, > > before we do any segment register based tricks. > > > > Using the techniques previously mentioned, for 224 vectors: > > 1792 bytes ( 8 bytes/stub) - trivial. > 1568 bytes ( 7 bytes/stub) - same without alignment. > 952 bytes (~4 bytes/stub) - extra jump needed. > > For comparison, the IDT itself is 2048 bytes on x86-32 and 4096 bytes on > x86-64. sounds like a plan :) Ingo -- 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/