Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754036AbYGXJaD (ORCPT ); Thu, 24 Jul 2008 05:30:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751234AbYGXJ3v (ORCPT ); Thu, 24 Jul 2008 05:29:51 -0400 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:52657 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1750744AbYGXJ3u (ORCPT ); Thu, 24 Jul 2008 05:29:50 -0400 Date: Thu, 24 Jul 2008 02:29:50 -0700 (PDT) Message-Id: <20080724.022950.20171380.davem@davemloft.net> To: mingo@elte.hu Cc: herbert@gondor.apana.org.au, w@1wt.eu, davidn@davidnewall.com, torvalds@linux-foundation.org, akpm@linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stefanr@s5r6.in-berlin.de, rjw@sisk.pl, ilpo.jarvinen@helsinki.fi Subject: Re: [TCP bug, regression] stuck distcc connections in latest -git From: David Miller In-Reply-To: <20080724092517.GA31358@elte.hu> References: <20080724060448.GA10203@elte.hu> <20080724092517.GA31358@elte.hu> X-Mailer: Mew version 5.2 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1107 Lines: 30 From: Ingo Molnar Date: Thu, 24 Jul 2008 11:25:18 +0200 > ok, i've booted the latest kernel on dione and the builds are running on > it now. It's using these settings currently: > > # cat /proc/sys/net/ipv4/tcp_syncookies > 0 > # cat /proc/sys/net/ipv4/tcp_sack > 1 > > Just to make sure i have the right test-plan: assuming this > suspected-good kernel is trouble-free for say 48 hours, i should be able > to switch back to the suspected-broken variant, by doing: > > echo 1 > /proc/sys/net/ipv4/tcp_syncookies > > without rebooting the kernel, right? And then if the bug comes back > again we've nailed it down to the area you suspect, correct? You don't need the explicit tcp_sack=1, it's going to be '1' by default. Simply switching syncookies on and off will turn both SACK and timestamps off when running the dist kernel. -- 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/