Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755206AbYKKFCB (ORCPT ); Tue, 11 Nov 2008 00:02:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750803AbYKKFBv (ORCPT ); Tue, 11 Nov 2008 00:01:51 -0500 Received: from terminus.zytor.com ([198.137.202.10]:47528 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750711AbYKKFBu (ORCPT ); Tue, 11 Nov 2008 00:01:50 -0500 Message-ID: <49191185.2000102@zytor.com> Date: Mon, 10 Nov 2008 21:00:53 -0800 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Alexander van Heukelum CC: Ingo Molnar , 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 References: <20081104122839.GA22864@mailshack.com> <20081104150729.GC21470@localhost> <20081104170501.GE29626@one.firstfloor.org> <1225822006.21441.1282961299@webmail.messagingengine.com> <20081104204400.GC10825@elte.hu> <1226243805.27361.1283784629@webmail.messagingengine.com> <20081110085846.GG22392@elte.hu> <1226321061.23701.1283927805@webmail.messagingengine.com> <20081110130709.GA32613@elte.hu> <1226352907.25721.1284024167@webmail.messagingengine.com> In-Reply-To: <1226352907.25721.1284024167@webmail.messagingengine.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 940 Lines: 22 Okay, after spending most of the day trying to get something that isn't completely like white noise (interesting problem, otherwise I'd have given up long ago) I did, eventually, come up with something that looks like it's significant. I did a set of multiple runs, and am looking for the "waterfall points" in the cumulative statistics. http://www.zytor.com/~hpa/baseline-hpa-3000-3600.pdf This particular set of data points was gathered on a 64-bit kernel, so I didn't try the segment technique. It looks to me that the collection of red lines is enough to the left of the black ones that one can assume there is a significant effect, probably by about a cache miss worth of time. -hpa -- 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/