Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261921AbTIJKy1 (ORCPT ); Wed, 10 Sep 2003 06:54:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261977AbTIJKy1 (ORCPT ); Wed, 10 Sep 2003 06:54:27 -0400 Received: from pix-525-pool.redhat.com ([66.187.233.200]:40890 "EHLO devserv.devel.redhat.com") by vger.kernel.org with ESMTP id S261921AbTIJKy0 (ORCPT ); Wed, 10 Sep 2003 06:54:26 -0400 Date: Wed, 10 Sep 2003 12:54:22 +0200 From: Arjan van de Ven To: Luca Veraldi Cc: Arjan van de Ven , linux-kernel Subject: Re: Efficient IPC mechanism on Linux Message-ID: <20030910125422.D9878@devserv.devel.redhat.com> References: <20030909175821.GL16080@Synopsys.COM> <001d01c37703$8edc10e0$36af7450@wssupremo> <20030910064508.GA25795@Synopsys.COM> <015601c3777c$8c63b2e0$5aaf7450@wssupremo> <1063185795.5021.4.camel@laptop.fenrus.com> <20030910095255.GA21313@mail.jlokier.co.uk> <20030910120729.C14352@devserv.devel.redhat.com> <20030910103752.GC21313@mail.jlokier.co.uk> <20030910124151.C9878@devserv.devel.redhat.com> <02bc01c37789$ebfa9a40$5aaf7450@wssupremo> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <02bc01c37789$ebfa9a40$5aaf7450@wssupremo>; from luca.veraldi@katamail.com on Wed, Sep 10, 2003 at 12:54:32PM +0200 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 705 Lines: 14 On Wed, Sep 10, 2003 at 12:54:32PM +0200, Luca Veraldi wrote: > > Memory is sort of starting to be like disk IO in this regard. > > Good. So the less you copy memory all around, the better you permorm. Actually it's "the less discontiguos memory you touch the better you perform". Just like a 128Kb read is about the same cost as a 4Kb disk read, the same is starting to become true for memory copies. So in the extreme the memory copy is one operation only. - 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/