From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754585AbYH0WgJ (ORCPT ); Wed, 27 Aug 2008 18:36:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751003AbYH0Wfz (ORCPT ); Wed, 27 Aug 2008 18:35:55 -0400 Received: from one.firstfloor.org ([213.235.205.2]:55002 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751747AbYH0Wfy (ORCPT ); Wed, 27 Aug 2008 18:35:54 -0400 Date: Thu, 28 Aug 2008 00:38:28 +0200 From: Andi Kleen To: David Miller Cc: andi@firstfloor.org, dada1@cosmosbay.com, rick.jones2@hp.com, johnpol@2ka.mipt.ru, denys@visp.net.lb, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: loaded router, excessive getnstimeofday in oprofile\ Message-ID: <20080827223828.GD26610@one.firstfloor.org> References: <20080827165635.GY26610@one.firstfloor.org> <48B58E6B.1030302@cosmosbay.com> <20080827183216.GZ26610@one.firstfloor.org> <20080827.152314.218610441.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080827.152314.218610441.davem@davemloft.net> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > This is a much different kind of delay compared to sleeping for seconds > or longer on the socket lock while a GFP_KERNEL allocation is being > satisfied by swapping tons of crap out to disk. When this happens then new incoming packets will be lost anyways because there will be no new packets fed back into the RX ring because their allocation will either stall or fail too. I don't think time stamps of dropped packets are very useful ;-) -Andi -- ak@linux.intel.com