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 13:32:23 -0700 (PDT) Message-ID: <20080828.133223.119110675.davem@davemloft.net> References: <48B6E7D0.5070307@hp.com> <20080828.124251.149964287.davem@davemloft.net> <48B70AAA.7010504@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]:39594 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1755172AbYH1Uc1 (ORCPT ); Thu, 28 Aug 2008 16:32:27 -0400 In-Reply-To: <48B70AAA.7010504@hp.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Rick Jones Date: Thu, 28 Aug 2008 13:29:30 -0700 > Has the request "hit the trading system" when it hits the NIC, or > when it hits the application executing the trade? If the SEC calls > for when it hits the NIC, then none of what is done today is really > accurate/correct and one would need to start using NIC HW > timestamps, synchronized with the host and the other NICs in the > system no? The SEC isn't mandating anything here, stop framing it that way :-) People simply won't trade with a firm if they find out that trades there are executed out of order. They are simply trying to make things as fair as possible.