Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268726AbUJTRW0 (ORCPT ); Wed, 20 Oct 2004 13:22:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268667AbUJTQ5J (ORCPT ); Wed, 20 Oct 2004 12:57:09 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:24468 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S268690AbUJTQzW (ORCPT ); Wed, 20 Oct 2004 12:55:22 -0400 Subject: Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option From: Lee Revell To: Andrea Arcangeli Cc: Arjan van de Ven , Timothy Miller , Hugh Dickins , "Martin J. Bligh" , Andrea Arcangeli , Alan Cox , Chris Wedgwood , LKML , Christoph Hellwig In-Reply-To: <20041020165050.GA24619@dualathlon.random> References: <593560000.1094826651@[10.10.2.4]> <20040910151538.GA24434@devserv.devel.redhat.com> <20040910152852.GC15643@x30.random> <20040910153421.GD24434@devserv.devel.redhat.com> <41768858.8070709@techsource.com> <20041020153521.GB21556@devserv.devel.redhat.com> <1098290345.1429.65.camel@krustophenia.net> <20041020165050.GA24619@dualathlon.random> Content-Type: text/plain Message-Id: <1098291315.1429.79.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Wed, 20 Oct 2004 12:55:17 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 863 Lines: 20 On Wed, 2004-10-20 at 12:50, Andrea Arcangeli wrote: > On Wed, Oct 20, 2004 at 12:39:06PM -0400, Lee Revell wrote: > > The IDE I/O completion in hardirq context means that one can run for > > almost 3ms. Apparently at OLS it was decided that the target for > > desktop responsiveness was 1ms. So this is a real problem. > > comparing netsted irqs to a context switch is a red herring. This was not my point, I agree that the two have nothing to do with each other. But if a hardirq handler runs for 3ms then no user code can run for 3ms. Therefore this is a problem if our goal for desktop response is 1ms. Lee - 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/