To: Rick Jones <rick.jones2@hp.com>
Cc: Joe Malicki <jmalicki@metacarta.com>, David Miller <davem@davemloft.net>,
       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
Subject: Re: loaded router, excessive getnstimeofday in oprofile
In-Reply-To: Your message of "Thu, 28 Aug 2008 11:00:48 PDT."
             <48B6E7D0.5070307@hp.com>
From: Valdis.Kletnieks@vt.edu
References: <21915755.1327801219904892242.JavaMail.root@ouachita>
            <48B6E7D0.5070307@hp.com>
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Date: Sun, 31 Aug 2008 22:39:16 -0400
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On Thu, 28 Aug 2008 11:00:48 PDT, Rick Jones said:

> Earlier in the thread mention was made of financial services types.  If 
> someone has knowledge of the (probably) arcane rules under which they 
> must operate it would be great to hear more.  Does some entity like the 
> SEC (Securities and Exchange Commission in the United States) mandate 
> some sort of timestamp for when the trading request "arrives at the 
> trading system" and do they define that "arriving at the trading system" 
> means?

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.

At that point, you have *bigger* things to worry about.

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