From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: loaded router, excessive getnstimeofday in oprofile Date: Thu, 28 Aug 2008 13:47:01 -0700 (PDT) Message-ID: <20080828.134701.116492932.davem@davemloft.net> References: <48B70AAA.7010504@hp.com> <20080828.133223.119110675.davem@davemloft.net> <48B70E74.2000800@hp.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: jmalicki@metacarta.com, andi@firstfloor.org, johnpol@2ka.mipt.ru, dada1@cosmosbay.com, denys@visp.net.lb, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, juhlenko@akamai.com, sammy@sammy.net To: rick.jones2@hp.com Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:38219 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754637AbYH1UrG (ORCPT ); Thu, 28 Aug 2008 16:47:06 -0400 In-Reply-To: <48B70E74.2000800@hp.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Rick Jones Date: Thu, 28 Aug 2008 13:45:40 -0700 > Given that there are no guarantees that a packet arriving on NIC 1 > and timestamped either by the NIC HW or the driver will actually hit > the application before a packet arriving on NIC2, just how long are > these financial services applications going to wait around before > executing the trade carried in the packet arriving on NIC1? I have no idea. They also care about trade processing latency btw.