Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267476AbUIJPev (ORCPT ); Fri, 10 Sep 2004 11:34:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267494AbUIJPev (ORCPT ); Fri, 10 Sep 2004 11:34:51 -0400 Received: from mx1.redhat.com ([66.187.233.31]:10174 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S267476AbUIJPes (ORCPT ); Fri, 10 Sep 2004 11:34:48 -0400 Date: Fri, 10 Sep 2004 17:34:21 +0200 From: Arjan van de Ven To: Andrea Arcangeli Cc: 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 Message-ID: <20040910153421.GD24434@devserv.devel.redhat.com> References: <593560000.1094826651@[10.10.2.4]> <20040910151538.GA24434@devserv.devel.redhat.com> <20040910152852.GC15643@x30.random> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="9dgjiU4MmWPVapMU" Content-Disposition: inline In-Reply-To: <20040910152852.GC15643@x30.random> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1401 Lines: 42 --9dgjiU4MmWPVapMU Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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... --9dgjiU4MmWPVapMU Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFBQcl8xULwo51rQBIRAtUEAJ93Opmn3LhXb169OVO1vQjTnp8S+QCgoQ9D vVeJKUxXLSaUXYADyNCX1GI= =BXIc -----END PGP SIGNATURE----- --9dgjiU4MmWPVapMU-- - 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/