From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: loaded router, excessive getnstimeofday in oprofile Date: Sun, 31 Aug 2008 20:51:45 -0700 (PDT) Message-ID: <20080831.205145.225080276.davem@davemloft.net> References: <21915755.1327801219904892242.JavaMail.root@ouachita> <48B6E7D0.5070307@hp.com> <20031.1220236756@turing-police.cc.vt.edu> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: rick.jones2@hp.com, 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: Valdis.Kletnieks@vt.edu Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:35627 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751099AbYIADvw (ORCPT ); Sun, 31 Aug 2008 23:51:52 -0400 In-Reply-To: <20031.1220236756@turing-police.cc.vt.edu> Sender: netdev-owner@vger.kernel.org List-ID: From: Valdis.Kletnieks@vt.edu Date: Sun, 31 Aug 2008 22:39:16 -0400 > As a totally pragmatic point - if the market is in such free-fall that it > matters that your order got in a 10 thousandth of a second after somebody > else's, instead of before, you probably lost at least 5 to 10 times as much > during the time it took somebody to type the damn order in and hit enter. Many trades are made programaticcally using formulas and computer algorithms in response to market activity and other trades of the same security. There is no typing involved :) I don't think anyone in this thread can even pretend to understand how any of this stuff works, that's why I'm starting to consider this thread completely pointless. If the financial folks say they need this stuff, then unless we're prepared to become experts in financial markets and how the IT stuff for them are designed and run, we might as well just trust them on this one.