Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268805AbUILTez (ORCPT ); Sun, 12 Sep 2004 15:34:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268812AbUILTez (ORCPT ); Sun, 12 Sep 2004 15:34:55 -0400 Received: from mx2.elte.hu ([157.181.151.9]:21720 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S268805AbUILTes (ORCPT ); Sun, 12 Sep 2004 15:34:48 -0400 Date: Sun, 12 Sep 2004 21:35:42 +0200 From: Ingo Molnar To: Chris Wedgwood Cc: Lee Revell , Arjan van de Ven , Andrea Arcangeli , Hugh Dickins , "Martin J. Bligh" , Andrea Arcangeli , Alan Cox , LKML , Christoph Hellwig Subject: Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option Message-ID: <20040912193542.GB28791@elte.hu> References: <593560000.1094826651@[10.10.2.4]> <20040910151538.GA24434@devserv.devel.redhat.com> <20040910152852.GC15643@x30.random> <20040910153421.GD24434@devserv.devel.redhat.com> <1095016687.1306.667.camel@krustophenia.net> <20040912192515.GA8165@taniwha.stupidest.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040912192515.GA8165@taniwha.stupidest.org> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 607 Lines: 20 * Chris Wedgwood wrote: > > The glaring exception is the IDE io completion, which can run for > > 2000+ usec even with a modern chipset and drive. > > does un-masking irqs help? no. A 2 msec nonpreemptable delay is a 2 msec delay, irqs on or off alike. but it's not a big problem with IRQ threading, there most hardirqs are preemptable. 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/