linux-kernel - Re: loaded router, excessive getnstimeofday in oprofile

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Message-ID: <20031.1220236756@turing-police.cc.vt.edu>
Date:	Sun, 31 Aug 2008 22:39:16 -0400
From:	Valdis.Kletnieks@...edu
To:	Rick Jones <rick.jones2@...com>
Cc:	Joe Malicki <jmalicki@...acarta.com>,
	David Miller <davem@...emloft.net>, andi@...stfloor.org,
	johnpol@....mipt.ru, dada1@...mosbay.com, denys@...p.net.lb,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	juhlenko@...mai.com, sammy@...my.net
Subject: Re: loaded router, excessive getnstimeofday in oprofile

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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