From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758216AbZHQWfc (ORCPT ); Mon, 17 Aug 2009 18:35:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751228AbZHQWfc (ORCPT ); Mon, 17 Aug 2009 18:35:32 -0400 Received: from outbound-dub.frontbridge.com ([213.199.154.16]:45628 "EHLO IE1EHSOBE001.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751176AbZHQWfb (ORCPT ); Mon, 17 Aug 2009 18:35:31 -0400 X-SpamScore: -16 X-BigFish: VPS-16(zz1432R98dNzz1202hzzz2fh6bh66h) X-Spam-TCS-SCL: 5:0 Message-ID: <4A89DB15.6060101@am.sony.com> Date: Mon, 17 Aug 2009 15:35:01 -0700 From: Tim Bird User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Robert Schwebel CC: Denys Vlasenko , linux-kernel@vger.kernel.org, linux-embedded@vger.kernel.org, Arjan van de Ven , kernel@pengutronix.de Subject: new ipdelay= option for faster netboot (was Re: New fast(?)-boot results on ARM) References: <20090814170228.GM13320@pengutronix.de> <1158166a0908141304y70300ab3p899b0d4609efded9@mail.gmail.com> <20090814204305.GA31727@pengutronix.de> <4A89AC40.2040109@am.sony.com> In-Reply-To: <4A89AC40.2040109@am.sony.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 17 Aug 2009 22:35:02.0620 (UTC) FILETIME=[F5F989C0:01CA1F8A] X-SEL-encryption-scan: scanned Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tim Bird wrote: > See the definitions of CONF_PRE_OPEN and CON_POST_OPEN > in net/ipv4/ipconfig.c > > They are set to ridiculously long values. In my experience, > you can cut them down considerably with no dangerous side > effects (but I haven't asked the network guys about the > possible downsides). It turns out that others have seen this delay. Simon Arlott recently posted a patch to make the delay avoidable at boot time from the kernel command line. See http://patchwork.kernel.org/patch/31678/ -- Tim ============================= Tim Bird Architecture Group Chair, CE Linux Forum Senior Staff Engineer, Sony Corporation of America =============================