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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next-2.6] inetpeer: lower false sharing effect
Date: Thu, 09 Jun 2011 20:43:30 -0700 (PDT)
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From: Tim Chen <tim.c.chen@linux.intel.com>
Date: Thu, 09 Jun 2011 17:03:55 -0700

> When I retest with original 3.0-rc2 kernel, inet_putpeer no longer shows
> up, wonder if dst->peer was not set for some reason. 

The overhead will only show up if an inetpeer entry exists for
the destination IP address.

You can force one to be created, for example, by making a TCP
connection to that destination.