Date: Thu, 30 Oct 2008 11:15:26 -0700
From: Stephen Hemminger <shemminger@vyatta.com>
To: Evgeniy Polyakov <zbr@ioremap.net>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, Ingo Molnar <mingo@elte.hu>,
       Evgeniy Polyakov <s0mbre@tservice.net.ru>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>, linux-kernel@vger.kernel.org,
       netdev@vger.kernel.org, David Miller <davem@davemloft.net>,
       Mike Galbraith <efault@gmx.de>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [tbench regression fixes]: digging out smelly deadmen.
Message-ID: <20081030111526.7d9bb0f8@extreme>
In-Reply-To: <20081026122300.GA30905@ioremap.net>
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	<20081010115518.GA3159@tservice.net.ru>
	<20081010115725.GD19487@elte.hu>
	<200810250025.35734.rjw@sisk.pl>
	<20081026112924.GA29258@ioremap.net>
	<20081026122300.GA30905@ioremap.net>
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Has anyone looked into the impact of port randomization on this benchmark.
If it is generating lots of sockets quickly there could be an impact:
  * port randomization causes available port space to get filled non-uniformly
    and what was once a linear scan may have to walk over existing ports.
    (This could be improved by a hint bitmap)

  * port randomization adds at least one modulus operation per socket
    creation. This could be optimized by using a loop instead.
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