Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268028AbUJTPyb (ORCPT ); Wed, 20 Oct 2004 11:54:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268467AbUJTPxf (ORCPT ); Wed, 20 Oct 2004 11:53:35 -0400 Received: from kinesis.swishmail.com ([209.10.110.86]:50703 "EHLO kinesis.swishmail.com") by vger.kernel.org with ESMTP id S268028AbUJTPfJ (ORCPT ); Wed, 20 Oct 2004 11:35:09 -0400 Message-ID: <41768858.8070709@techsource.com> Date: Wed, 20 Oct 2004 11:46:32 -0400 From: Timothy Miller MIME-Version: 1.0 To: Arjan van de Ven CC: Andrea Arcangeli , Hugh Dickins , "Martin J. Bligh" , Andrea Arcangeli , Alan Cox , Chris Wedgwood , LKML , Christoph Hellwig Subject: Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option References: <593560000.1094826651@[10.10.2.4]> <20040910151538.GA24434@devserv.devel.redhat.com> <20040910152852.GC15643@x30.random> <20040910153421.GD24434@devserv.devel.redhat.com> In-Reply-To: <20040910153421.GD24434@devserv.devel.redhat.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1187 Lines: 37 Arjan van de Ven wrote: > On Fri, Sep 10, 2004 at 05:28:52PM +0200, Andrea Arcangeli wrote: > >>On Fri, Sep 10, 2004 at 05:15:38PM +0200, Arjan van de Ven wrote: >> >>>because it gives people a reason to do sloppy coding. >> >>it's not about bad drivers, it's about the number of nested interrupts >>not being limited by software right now. >> >> >>>What we should consider regardless is disable the nesting of irqs for >>>performance reasons but that's an independent matter >> >>disabling nesting completely sounds a bit too aggressive, but limiting >>the nesting is probably a good idea. > > > disabling is actually not a bad idea; hard irq handlers run for a very short > time, but when they nest you effectively have like a semi context switch in > the middle of the work so performance suffers... > The rules about how long a hard irq would be allowed to run would have to be draconian. ... not that that would be a problem. - 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/