From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261679AbULNVnQ (ORCPT ); Tue, 14 Dec 2004 16:43:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261678AbULNVnN (ORCPT ); Tue, 14 Dec 2004 16:43:13 -0500 Received: from mustang.oldcity.dca.net ([216.158.38.3]:57267 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S261672AbULNVkj (ORCPT ); Tue, 14 Dec 2004 16:40:39 -0500 Subject: Re: RCU question From: Lee Revell To: Andrea Arcangeli Cc: Manfred Spraul , Zwane Mwaikambo , George Anzinger , dipankar@in.ibm.com, ganzinger@mvista.com, lkml , Ingo Molnar In-Reply-To: <20041212121546.GM16322@dualathlon.random> References: <41BA59F6.5010309@mvista.com> <41BA698E.8000603@mvista.com> <41BB2108.70606@colorfullife.com> <41BB25B2.90303@mvista.com> <41BC0854.4010503@colorfullife.com> <20041212093714.GL16322@dualathlon.random> <41BC1BF9.70701@colorfullife.com> <20041212121546.GM16322@dualathlon.random> Content-Type: text/plain Date: Tue, 14 Dec 2004 16:40:37 -0500 Message-Id: <1103060437.14699.27.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Evolution 2.0.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2004-12-12 at 13:15 +0100, Andrea Arcangeli wrote: > Overall this is a very minor issue (unless HZ is 0), it would only > introduce a 1/HZ latency to the irq that get posted while the nmi > handler is running, and the nmi handlers never runs in production. Ingo, couldn't this account for some of the inexplicable outliers some people were seeing in latency tests? Lee